Chapter Summaries

Key Plot Points and Events

• The trial for Leo, Rias, and Sona involves facing three Vermilion Dragons, powerful fire-breathing dragon species.
• The trio avoids the initial fire attacks and engages the dragons.
• Sona uses her water magic to counter and weaken her dragon, while Rias uses her destructive power to instantly vaporize hers.
• Leo, meanwhile, has already defeated his dragon without any visible struggle.

Character Developments

• Rias showcases her immense destructive power, defeating her dragon with a single strike.
• Sona demonstrates her advanced water control technique, creating various water creatures to attack her dragon.
• Leo subtly reveals his strength by defeating his dragon quickly and quietly, surprising Rias and Sona.

Significant Themes

• The power of destruction (Rias) vs. precise control (Sona) vs. efficiency (Leo).
• The importance of teamwork and strategy in battle.

Character Interactions

• Rias and Sona's friendly competition drives them to defeat their dragons quickly.
• Leo's subtle, efficient victory causes Rias and Sona to reevaluate his strength.
• The trio's tacit understanding and cooperation allow them to overcome the trial together.

• Leo defeats a vermilion dragon with ease, surprising Rias Gremory and Sona Shitori, who realize his strength is greater than they thought.
• Rias and Sona deduce that Leo might have surpassed high-class devil status and could be at an even higher level.
• They decide to leave the room and continue through the labyrinth, prioritizing finding the master of the space or reuniting with their peerage members.
• Rias and Sona discuss the old satan faction's possible motives and strength, concluding that the attackers might be only a fraction of the faction and not direct descendants of the original maou.
• Leo, Rias, and Sona rush through a corridor and enter the next room, where a new trial awaits them.

Key Plot Points and Events

• Leo, Rias, and Sona face trials in four consecutive rooms.
  • Room 1: An ice dragon, stronger than the previous vermilion dragon, is defeated by Leo.
  • Room 2: A miasma trap affects pure-blood devils; Leo, being half-human, clears the room with magic.
  • Room 3: A light magic trap is destroyed by Rias and Sona's combined attack.
  • Room 4: They encounter Leif Trix, the mastermind behind the traps, who reveals his past and hatred.

Character Developments

• Leo demonstrates his strength and adaptability, surviving all trials with minimal impact.
• Rias and Sona show their power and teamwork but struggle against traps targeting pure-blood devils.
• Leif Trix is revealed to be an ultimate-class devil from the fallen Trix clan, seeking revenge against the Sitri clan.

Significant Themes

• The impact of the past on the present (Leif's grudge against the Sitri clan).
• The struggle against prejudice and discrimination (Leif's ostracization and Leo's half-human heritage).
• Teamwork and adaptability in the face of adversity (Leo, Rias, and Sona's cooperation).

Character Interactions

• Leo, Rias, and Sona work together to overcome each trial, showcasing their trust and teamwork.
• Leif Trix interacts with the trio, expressing his hatred and desire for revenge, particularly against Sona Sitri.
• Leo, Rias, and Sona provoke Leif, leading to his outburst and revealing his true power level.

Key Plot Points

• Leif reveals that the previous rooms were set up to test traps and prevent accidents, not to wear down Leo's group.
• Leif summons devils from the old satan faction to attack Leo, Rias, and Sona.
• Leo, Rias, and Sona defend against the onslaught, with Leo ultimately blocking a full-power strike from Leif.
• Leo reveals his ability to reach the ultimate-class devil level, shocking everyone.
• Leo and Leif engage in a direct confrontation, with Leo unleashing powerful magic bullets.

Character Developments

• Leo demonstrates his immense power, reaching the ultimate-class devil level and holding his own against Leif.
• Rias and Sona show their strength but are still no match for Leif's full-power strikes.
• Leif is revealed to be more powerful than initially thought, but his pride leads him to underestimate his opponents.

Significant Themes

• The power dynamics between the new-generation devils and the old satan faction.
• The importance of strategy and preparation in battle, as shown by Leif's setup of the labyrinth.
• The consequences of underestimating opponents, as seen through Leif's reaction to Leo's strength.

Character Interactions

• Leo, Rias, and Sona work together to defend against the old satan faction devils, showing unity and trust.
• Leo and Leif engage in a direct confrontation, showcasing their power and pride.
• The old satan faction devils flee in fear upon seeing Leo's true power, highlighting their lack of loyalty or courage.

Key Plot Points and Events

• The number of wings a devil, angel, or fallen angel has represents their status, not directly their combat strength.
• Leo displays eight wings, shocking the devils present, including Leif, who becomes jealous and attacks Leo.
• Leif unleashes a barrage of magic, but Leo easily dodges and counters, severely wounding Leif.
• Leo prepares a finishing blow, but Leif pulls out a mysterious bottle.

Character Developments

• Leo: Proves his strength and status by displaying eight wings and defeating Leif.
• Leif: Becomes consumed by jealousy and loses control, leading to his defeat.

Significant Themes

• Status vs. Combat Strength: The number of wings indicates status, but not necessarily combat prowess.
• Jealousy: Leif's jealousy of Leo's achievements leads to his downfall.

Character Interactions

• Leo vs. Leif: Leo's display of eight wings shocks Leif, leading to a battle where Leo emerges victorious.
• Sona Shitori & Rias Gremory: Sona tries to rush to Leo's aid, but Rias holds her back due to the dangerous battle.

Key Plot Points and Events

• Leif swallows a mysterious vial containing a small, unstable black snake, causing a massive surge in his demonic power.
• Leif's power increases dramatically, rivaling that of a ten-winged class devil.
• Leo, Rias, and Sona Shitori witness scenes of their peerage members facing dire situations in various rooms of the labyrinth space.

Character Developments

• Leif becomes overconfident and malicious after gaining immense power, plotting to kill Leo and the others.
• Rias and Sona Shitori become worried and enraged upon seeing their peerage members in danger.
• Leo remains composed but concerned, especially when seeing his first peerage member, Yukino Yukinoshita, in critical condition.
• Yukino Yukinoshita is severely injured but manages to hold on against Sharon, who has grown stronger by feeding her anti-devil exorcism swords with devil flesh (including her own).

Significant Themes

• The consequences of relying on external power sources (Leif's sudden strength boost).
• The importance of unity and teamwork (the peerage members' struggles without their leaders).
• The lengths one will go to for power (Sharon feeding her weapons with devil flesh, including her own).

Character Interactions

• Leif and Leo: Leif taunts Leo, claiming his new power makes him unstoppable, while Leo remains composed and dismissive of Leif's boasts.
• Rias and Sona Shitori: They share concern and anger upon seeing their peerage members in danger, reacting emotionally.
• Yukino Yukinoshita and Sharon: Despite her dire situation, Yukino maintains a sarcastic and defiant attitude towards Sharon, who reveals her method for gaining power.

Key Plot Points and Events

• Sharon reveals the devil slayer's origin as a failed weapon due to its severe contamination effects on the wielder's spirit.
• Sharon, unconcerned about the weapon's side effects, uses it to enhance her strength against devils.
• Leo activates his Sacred Gear, a top-tier Longinus, dominating the sky and manipulating lightning against Leif.
• Leif, recognizing Leo's power, unleashes a barrage of magic masses, creating a chaotic battlefield.
• Leo tears off Leif's wings, causing him immense pain and incapacitating him.

Character Developments

• Sharon: Reveals her disregard for the devil slayer's side effects, prioritizing its power enhancement.
• Leo: Demonstrates his immense power and control over the battlefield upon activating his Sacred Gear.
• Leif: Shows fear and desperation when facing Leo's power, resorting to reckless attacks and ultimately suffering a severe injury.

Significant Themes

• Power and its consequences: The devil slayer's power comes at the cost of the wielder's spiritual contamination.
• Fear and desperation: Leif's reaction to Leo's power reveals his vulnerability and lack of control.
• Domination and control: Leo's mastery over his Sacred Gear allows him to dominate the battlefield and manipulate the environment.

Character Interactions

• Sharon vs. Yukino Yukinoshita: Sharon's relentless assault pushes Yukino into a disadvantageous position.
• Leo vs. Leif: Leo's activation of his Sacred Gear turns the tide of the battle, striking fear into Leif and ultimately injuring him.
• Rias Gremory, Sona Shitori, and others: They react with shock and surprise to Mahiru Shiina's purple flame and Leo's Sacred Gear, then flee the chaotic battlefield created by Leif.

Key Plot Points and Events

• Leo, despite his devil status, maintains human-like compassion and control over his emotions.
• Leif, enraged by Leo's actions, overuses his demonic power, leading to his self-destruction.
• Leo activates his sacred gear, Zenith Tempest, and unleashes a powerful, elemental natural disaster that defeats Leif.

Character Developments

• Leo demonstrates his maturity and self-control, even in the face of provocation.
• Leif's desperation and recklessness lead to his downfall, highlighting the consequences of his actions.

Significant Themes

• The consequences of one's actions and choices.
• The struggle between self-control and recklessness.
• The power of sacred gears and their potential to tip the balance in battles.

Character Interactions

• Leo and Leif's intense, climactic battle, driven by anger and desperation on Leif's part, and calm determination on Leo's.
• Rias Gremory and Sona Shitori, forced to engage the remaining devils, showcase their teamwork and skill.

Key Plot Points and Events

• A meeting is held among high-ranking devils in Lilith, the capital of the Maou Territory.
• Rias Gremory, Sona Sitri, and their peerages were attacked by the Old Satan Faction at Kuoh Academy.
• The attackers forcibly transferred them to a different dimension, but they were later rescued.
• A detailed report of the incident is shared among the attendees.

Character Developments

• The blue figure (Sona's sister) shows concern and protectiveness towards Sona, reacting emotionally to the news of her safety.
• The red figure (Rias' brother) demonstrates responsibility and care for his sister's well-being.
• Leo Eligos' capabilities are recognized and praised by the attendees for his role in defeating the mastermind.

Significant Themes

• The importance of family and clan succession in the Underworld.
• The emotional reactions and priorities of the characters, particularly the blue figure's overprotection of Sona.

Character Interactions

• The red figure, green figure, and orange figure discuss the incident and its implications.
• The blue figure expresses her disapproval of Sona's potential marriage contract with Leo Eligos, causing her to become emotional and distraught.
• The other attendees tacitly ignore the blue figure's outburst and continue their discussion.

Key Plot Points and Events

• The old satan faction becomes active after centuries of dormancy, raising concerns among the current underworld leaders.
• The leaders discuss their past regrets about the war that led to the current power dynamics and agree to re-establish contact with the old satan faction to understand their intentions.
• They also discuss the recent attack by the old satan faction, noting the unusual use of monsters and stray mages, and the sudden power surge of Leif Trix.
• The leaders decide to investigate the old satan faction's movements, secrets, and potential collaborators.

Character Developments

• The red figure (leader) feels remorse for the past war and wishes they had explored coexistence instead of mutual slaughter.
• The blue figure (diplomat) expresses her desire to go to the human world to check on Sona Sitri but is persuaded to continue her diplomatic mission first.
• The leaders appreciate Leo (Zenith Tempest) and his potential to become a pillar of the underworld.

Significant Themes

• Regret and consequences of past actions.
• The importance of understanding and coexistence among different factions.
• The potential threat and attraction of powerful individuals like Leo.

Character Interactions

• The red, green, and orange figures discuss the old satan faction's activities and their past regrets.
• The blue figure expresses her desire to go to the human world, but the other leaders persuade her to continue her diplomatic mission.
• The leaders discuss Leo's potential and the threat he might attract from other factions.
• Other factions, such as the true satan faction and the fallen angels, also discuss Leo's emergence and their plans to make a move on him.

Key Plot Points and Events

• The chapter takes place in the Kuoh Academy occult research club's old school building, which serves as the base for Rias Gremory's peerage.
• Leo explains that Kuoh Academy is essentially Rias' territory, while Sobu High School is under his influence.
• Yukino Yukinoshita is recovering from serious injuries sustained in the labyrinth trial.
• Leo updates her on the conditions of their peerage members and the Gremory and Sitri peerages.
• Rias and Sona Shitori are preparing to obtain tears of the phoenix to heal Yuuto Kiba and Ruruko Nimura, who are severely injured.
• Leo praises Yukino for defeating Sharon Holy Grail and passing the first trial despite her injuries.

Character Developments

• Yukino Yukinoshita shows concern for her peers, prioritizing their well-being over her own.
• Leo demonstrates care and worry for Yukino, revealing his relief when she survived her injuries.
• Rias Gremory and Sona Shitori are shown to be proactive in seeking healing for their injured comrades.

Significant Themes

• Friendship and camaraderie among peerage members.
• The power dynamics and influence of high-ranking devils in the human world.
• The importance of healing and recovery after battles.

Character Interactions

• Leo and Yukino have a heart-to-heart conversation about her injuries and the labyrinth trial.
• Leo expresses his pride in Yukino's accomplishment, despite her initial failure.
• Leo shows understanding and support for Yukino's desire to share her experiences in the labyrinth.

Key Plot Points and Events

• Leo and Leif engage in a decisive battle, each using their ultimate powers.
• Yukino and Sharon fight in a separate dimension, with Sharon's power overwhelming Yukino.
• Yukino uses ice walls and blades to defend against Sharon's relentless attacks.
• Sharon expresses her intention to kill Yukino, who refuses to yield.

Character Developments

• Yukino demonstrates resilience and determination, refusing to give up despite her injuries.
• Sharon shows no mercy, pursuing her mission to eliminate devils with single-minded focus.
• Yukino begins to question Sharon's motives and the truth behind her hatred for devils.

Significant Themes

• The power of determination and resilience in the face of overwhelming odds.
• The complexity of human (or devil) nature and the motivations behind one's actions.
• The struggle between personal beliefs and the truth.

Character Interactions

• Yukino and Sharon's battle highlights their contrasting personalities and fighting styles.
• Yukino's questions challenge Sharon's beliefs and force her to confront her own past.
• The conversation between Yukino and Sharon reveals the depth of their animosity and the complexity of their relationship.

Key Plot Points and Events

• Sharon reveals that she was an experiment subject of devils, not the church.
• The devils aimed to create 'transcendents'—anomalous beings with powers far surpassing devils.
• Sharon's hatred for devils stems from her past torture and the death of other experimental subjects.
• Sharon joins the church to exterminate devils, even betraying them for more power.

Character Developments

• Sharon: Reveals her past, motivations, and extreme hatred for devils. She's willing to do anything to exterminate them.
• Yukino Yukinoshita: Struggles with understanding Sharon's radical stance, but ultimately empathizes with her pain and despair.

Significant Themes

• Hatred and revenge: Sharon's all-consuming hatred for devils and her desire for revenge.
• Correctness vs. personal choice: Sharon chooses to follow her personal path, even if it's not the 'correct' one.
• Empathy and understanding: Yukino tries to understand Sharon's perspective, despite disagreeing with her methods.

Character Interactions

• Sharon and Yukino: Their conversation reveals Sharon's past and motivations, while Yukino struggles to accept Sharon's extreme stance.
• Sharon and Leo Eligor: Sharon believes Leo doesn't know about the devils' experiments, but he looks at her like a 'mental patient' due to her past.

Key Plot Points and Events

• Leo learns about Transcendents, beings with power far beyond typical devils, from Yukino.
• Three Transcendents are mentioned: Rizevim Livan Lucifer, Sirzechs Gremory, and Ajuka Beelzebub.
• Leo learns about the future power hierarchy and the existence of artificial transcendent experiments.
• Sharon Holygrail is revealed to be a victim of such an experiment.

Character Developments

• Leo gains new knowledge about the devil world's power structure and history.
• Yukino shows concern for Leo, warning him about the complex nature of the Underworld's politics.

Significant Themes

• Power dynamics and hierarchy among devils.
• The consequences of unchecked ambition and experimentation.
• The complex nature of the Underworld's politics and hidden truths.

Character Interactions

• Leo and Yukino discuss the revelations about Sharon and the Underworld.
• Leo expresses his understanding of the devil race's nature.
• Leo and Yukino's dynamic shows a level of familiarity and comfort, with Leo teasing Yukino and her responding with annoyance.

Key Plot Points and Events

• Yukino Yukinoshita seeks revenge on Sharon for the previous battle where she was outsmarted.
• Yukino uses her ice spirit familiar, Dongdong, to secretly carve magic circles within the ice, preparing a spell formula to counter Sharon.
• Sharon is frozen and unable to move, then engulfed by an ice-blue pillar of light, turning the room into an ice cave.
• Yukino leaves through a newly appeared passage, injured but victorious.

Character Developments

• Yukino Yukinoshita: Becomes more strategic and determined, using her familiar to outsmart her opponent. She's also more resilient, enduring injuries to escape.
• Sharon: Despite her experience, she underestimates Yukino and falls for her trap. She's ultimately defeated and frozen.

Significant Themes

• Revenge and payback for past defeats.
• The importance of strategy and adaptability in battle.
• The power of familiars and their utility beyond direct combat.

Character Interactions

• Yukino and Sharon: Their battle is a test of wits and power, with Yukino ultimately outmaneuvering Sharon.
• Yukino and Dongdong: Their bond is shown to be beneficial, with Dongdong aiding Yukino in her plan and healing her wounds.

Key Plot Points and Events

• Leo learns that Yukino Yukinoshita studied spell formulas to defeat Sharon.
• Leo explains that devils can form contracts with mages, mutually benefiting each other.
• Leo advises Yukino to focus on her demonic power and Sacred Gear for now.
• Leo checks on his peerage, finding them all asleep and recovering from the day's battle.
• Rias Gremory and Sona Shitori are worried about Yuuto Kiba and Ruruko Nimura, who are still in a coma.
• Leo offers to help fetch the tears of the phoenix from the underworld, but Sona assures him that the direct-line Maou will arrange for their delivery.

Character Developments

• Yukino Yukinoshita shows initiative and diligence in learning spell formulas to defeat Sharon.
• Leo demonstrates knowledge about contracts between devils and mages, showing his understanding of the devil business.
• Rias Gremory and Sona Shitori display concern and responsibility for their injured comrades.

Significant Themes

• The importance of knowledge and learning in combat and strategy.
• The mutual benefit of contracts between devils and mages.
• The responsibility and concern for one's comrades and allies.

Character Interactions

• Leo and Yukino Yukinoshita discuss her interest in spell formulas and the possibility of contracting with mages in the future.
• Leo checks on his peerage, showing care and concern for their well-being.
• Rias Gremory and Sona Shitori discuss the condition of Yuuto Kiba and Ruruko Nimura, showing worry and determination to help them.
• Leo offers his help to Rias and Sona, demonstrating his willingness to assist his allies.

Key Plot Points and Events

• Leo's peerage members, including Utaha, Mahiru, and Asuna, played a crucial role in protecting Rias' and Sona's peerages during an attack by the Old Satan Faction.
• Leo reveals he's the host of Zenith Tempest, a powerful Longinus, and has eight wings, making him an ultimate-class devil.
• Rias and Sona acknowledge Leo's strength and the potential danger he's in due to his unique abilities and peerage members' powerful sacred gears.

Character Developments

• Rias and Sona express gratitude towards Leo for saving their peerages.
• Leo reveals his hidden strength and sacred gear, showing his growth and confidence.
• Rias feels envy towards Sona for her accomplishments and Leo's affection.

Significant Themes

• Gratitude and recognition of Leo's strength and contributions.
• The power of Leo's peerage members and the potential danger they pose.
• Rias' envy and self-reflection on her own capabilities.

Character Interactions

• Rias and Sona express their thanks and concern for Leo's safety.
• Leo reassures them of his strength and confidence in facing potential threats.
• Rias feels envy towards Sona, highlighting her self-awareness and introspection.

Key Plot Points and Events

• Leo wakes up in the old school building of Kuoh Academy.
• He is led to the Occult Research Club room by a familiar.
• Rias Gremory and Sona Shitori are waiting for a visitor.
• A Maou (Sirzechs Lucifer) is about to arrive via a spatial teleportation magic circle.

Character Developments

• Leo is nervous about meeting a Maou but feels relieved when he learns it's Sirzechs Lucifer.
• Rias and Sona are solemn and respectful, awaiting the arrival of the Maou.
• Akeno and Tsubaki have recovered from their previous state and appear elegant.

Significant Themes

• Respect and formality towards high-ranking devils.
• Anticipation and nervousness when meeting powerful figures.
• The importance of the devil world's leaders (Maou).

Character Interactions

• Leo interacts with Rias, Sona, Akeno, and Tsubaki before Sirzechs's arrival.
• Sirzechs greets everyone present, including Leo, with kindness and informality.
• Leo and Sirzechs exchange polite greetings.

Key Plot Points and Events

• Sirzechs Lucifer visits Rias Gremory's peerage, bringing the tears of the phoenix to heal Yuuto Kiba and Ruruko Nimura.
• Sirzechs listens to Rias and Sona Shitori's account of the recent attack by the Old Satan Faction.
• Leo reveals that Leif Trix swallowed a small black snake with its tail in its mouth, reminiscent of Ouroboros.

Character Developments

• Sirzechs: Shows concern for his sister and her peerage, acting more like a caring brother than a Devil King.
• Rias Gremory: Demonstrates responsibility and maturity in reporting to Sirzechs.
• Sona Shitori: Displays meticulousness and attention to detail in recounting the attack.
• Leo: Shows caution in revealing information and understands the gravity of the Ouroboros symbol.

Significant Themes

• The power of Ouroboros and its potential threat to the devil world's balance.
• The responsibility and care of leaders (Sirzechs, Rias) towards their subordinates.
• The importance of information and its careful handling (Leo's cautious revelation).

Character Interactions

• Sirzechs interacts with Rias and her peerage, showing care and concern for their well-being.
• Rias and Sona Shitori work together to provide a detailed report to Sirzechs.
• Leo interacts with Sirzechs, revealing critical information about the Ouroboros symbol while being cautious not to reveal too much.

Key Plot Points and Events

• Sirzechs Lucifer and Leo arrive in the master chamber of the other-dimensional labyrinth space.
• Leo explains the labyrinth's mechanics and his role as its master.
• Sirzechs and Leo investigate the labyrinth, discovering clues about its creators and the Old Satan Faction's allies.
• Sirzechs suspects that Annihilation Maker, a top-tier Sacred Gear, is involved in providing monsters to the Old Satan Faction.
• Sirzechs and Leo decide to transfer the ownership of the labyrinth space to Sirzechs for further investigation.

Character Developments

• Sirzechs demonstrates his investigative skills and understanding of the situation's gravity.
• Leo shows maturity and sensibility in handling the labyrinth space's ownership transfer.

Significant Themes

• The Old Satan Faction's hidden alliances and resources.
• The power and danger of the Annihilation Maker Sacred Gear.
• The potential for betrayal within the Underworld's major devil families.

Character Interactions

• Sirzechs and Leo work together to investigate the labyrinth space, showcasing a cooperative and respectful relationship.
• Sirzechs reveals that Ajuka Beelzebub has been observing Leo's powers and has warned Sirzechs to caution Leo about potential prying eyes.