Chapter Summaries

The Sapphire Star tried to sneak aboard the Homeward Bound to escape becoming Fifth Fleet leader, planning to make Lone Bird take the job instead. The Field Team Leader caught her as the ship departed, leaving her escape plan in ruins.

• The Sapphire Star worried about leading the Fifth Fleet and decided to flee to the Old World and recruit Lone Bird as her replacement.
• She slipped aboard the Homeward Bound while the dockworkers were distracted and celebrated her apparent escape.
• The Sapphire Star plotted to persuade Lone Bird to take the leadership role, even considering using a big hammer if he refused.
• The Field Team Leader revealed he was aboard the ship, told her he was keeping the fleet leader's office key for her, and caught her as the Homeward Bound departed.

The Sapphire Star tried to sneak back to the Old World for a vacation, but the Field Team Leader intercepted her and insisted the Research Commission needed her in the New World. When her Fatalis Demolisher triggered a Scoutfly emergency alert, they prepared to face a nearby ancient threat, leaving her once again unable to escape.

• The Field Team Leader caught the Sapphire Star trying to leave for the Old World, and she complained that the Admiral could travel freely while she could not.
• The Sapphire Star lamented that she would have to return to the New World and fight monsters instead of enjoying a peaceful vacation.
• The Field Team Leader told her that Astera and Seliana were her home and that the Research Commission relied on her as the Fifth Fleet's symbol.
• The Sapphire Star touched the disguised Fatalis Demolisher, causing it to hum as her Scoutflies flashed red and went berserk.
• The Field Team Leader drew his signal flare launcher as he and the Sapphire Star sensed a savage ancient presence nearby.
• The Sapphire Star asked to return to the Old World after the fight, but the Field Team Leader refused.

Dire Miralis rose from the sea and targeted the Sapphire Star and the Fatalis Demolisher on her back, forcing the crew to evacuate as the Field Team Captain sent a distress flare. The Sapphire Star prepared to fight and vowed to drag Lone Bird to the New World if she survived.

• Dire Miralis’s awakening turned the seawater red and boiling, and the Field Team Captain ordered the ship’s passengers and crew to shelter belowdecks.
• The Sapphire Star warned everyone aboard to evacuate while the Field Team Captain fired a red distress flare for help.
• Dire Miralis’s heat began cracking the Velkhana disguise over the Fatalis Demolisher, and the Sapphire Star told the Field Team Captain she wanted to return to the Old World.
• The Sapphire Star vowed to bring Lone Bird to the New World as Dire Miralis rose from the sea and fixed its gaze on her and her weapon.
• The Sapphire Star grasped the Fatalis Demolisher and faced Dire Miralis with renewed battle spirit.

The Sapphire Star was dragged into a spatial vortex during her battle with Dire Miralis, but her Fatalis Demolisher protected her and sent her to an unfamiliar forest. She found a monster attacking a black-haired boy and intervened, blocking its crushing blow with her sheathed sword.

• Dire Miralis accelerated the lava vortex and pulled the Sapphire Star away from the ship before she could strike.
• The Fatalis Demolisher surrounded the Sapphire Star with ice and darkness, shielding her as she passed through a spatial barrier.
• The Sapphire Star landed in a strange forest of purple flowers and sensed terrified people being hunted by monsters.
• The Sapphire Star rushed to defend a fallen black-haired boy in checkered clothing from a massive humanoid creature.
• The Sapphire Star blocked the creature's blow with her sword's sheath, unleashing a surge of cold and darkness.

The Sapphire Star overwhelmed the Hand Demon at Mount Fujikasane, freezing and shattering his arms as she rescued the examinees. After he spoke and attacked her, she unleashed a powerful sword strike that destroyed his upper body, leaving the battlefield beneath an opening in the mist.

• The Sapphire Star froze and shattered the Hand Demon's arm when he attacked her.
• She pushed endangered examinees out of his reach and pierced one of the joints supporting his body.
• The Hand Demon spoke, raged about Urokodaki's disciples, and turned his many arms on the Sapphire Star.
• The Sapphire Star unleashed the Great Iai Slash, freezing and annihilating the Hand Demon's upper body.
• The blast tore through the mist overhead, and moonlight fell on the battlefield.

The Sapphire Star killed the Hand Demon with a powerful slash, then struggled to understand the unfamiliar forest and the Demon Slayer Corps candidates around her. Tanjiro thanked her and asked if she was a Hashira, but she did not understand the term, and she mistook Inosuke for a creature to hunt.

• The Sapphire Star examined the frozen remains of the Hand Demon and concluded that it could not regenerate after being smashed to pieces.
• The Sapphire Star surveyed the injured candidates and wondered where she was and why they all carried short swords.
• Tanjiro Kamado thanked the Sapphire Star for saving him and asked whether she was one of the Hashira.
• The Sapphire Star misunderstood the word Hashira and asked whether it meant building material or a monster.
• Inosuke leaped from the bushes and challenged the Sapphire Star, who asked Tanjiro whether the boar-masked boy was another creature to hunt.

The Sapphire Star mistook Inosuke’s challenge as a chance to spar and sent him crashing through the forest with a light punch. She healed his severe injuries with her supplies, then left him bewildered with a huge piece of Anjanath meat as she worried about Dire Miralis, the Field Team Captain, and the others.

• The Sapphire Star recognized Inosuke as a human in Boar Headgear and set down her weapon to meet his charge bare-handed.
• Inosuke charged with Beast Breathing: Second Fang, and the Sapphire Star sidestepped his blades and struck him so hard that he smashed through trees and collapsed in the bushes.
• The Sapphire Star panicked, then hurried with Tanjiro to check on Inosuke and used life-energy dust and an Ancient Potion to heal his injuries.
• The Sapphire Star treated Inosuke’s facial scratches with ointment and gave him roasted Anjanath meat as he woke up furious and confused.
• The Sapphire Star turned her attention to the unfamiliar world and worried about Dire Miralis, the Field Team Captain, and the others lost in spatial turbulence.

The Sapphire Star learned that she had been stranded in the Demon Slayer Corps’ world after appearing at Mount Fujikasane. Hinaki and Hika ended Final Selection early and promised to inform the Master about her, leaving her to accompany the candidates to the Wisteria Family residence.

• The Sapphire Star asked Tanjiro about Mount Fujikasane and confirmed it was the Demon Slayer Corps’ selection ground.
• The Sapphire Star watched the Kakushi clear away the demons’ remains and worried about being stranded far from her squad leader.
• Hinaki and Hika arrived and announced that Final Selection had ended early, directing the survivors to the Wisteria Family residence.
• The Sapphire Star introduced herself to Hinaki and Hika as a hunter from the Fifth Fleet and asked them to contact her organization.
• Hinaki and Hika agreed to relay the Sapphire Star’s request to the Master and told her to join the other candidates.

The Sapphire Star helped Tanjiro, Zenitsu, and Inosuke leave Mount Fujikasane, then met Kagaya Ubuyashiki to learn where she had been sent and offer help against demons. Kagaya told her that his world might have no road connecting it to hers.

• The Sapphire Star mourned the dead selection candidates, checked on Tanjiro, Zenitsu, and Inosuke, and led them down Mount Fujikasane.
• On the wisteria-lined path, Tanjiro explained demons, Muzan Kibutsuji, and the Demon Slayer Corps, while the Sapphire Star shared jerky with the boys.
• At the wisteria estate, a Kakushi sent Tanjiro, Zenitsu, and Inosuke for treatment and guided the Sapphire Star to Kagaya Ubuyashiki.
• The Sapphire Star introduced herself as a Fifth Fleet hunter, explained that Dire Miralis had thrown her into this world, and asked Kagaya about returning home and helping the Demon Slayer Corps.
• Kagaya told the Sapphire Star that his world was neither the Old World, the New World, nor the Frontier, and that there might be no road between their worlds.

The Sapphire Star learned that she was stranded in a world called Japan, where the Demon Slayer Corps fought demons created by Muzan Kibutsuji. After Kagaya Ubuyashiki questioned where her loyalties lay, she pledged to help kill Muzan while she searched for a way home.

• Kagaya Ubuyashiki told the Sapphire Star that her world and the Frontier had no known connection to Japan, leaving her to realize she might be stranded in another world.
• The Sapphire Star asked about Japan, its demons, and the Demon Slayer Corps, and Kagaya explained that Muzan Kibutsuji was the first demon and the source of a thousand years of suffering.
• Kagaya admitted that he had come to assess whether the Sapphire Star was a friend or threat after hearing reports of her power and her actions at Mount Fujikasane.
• The Sapphire Star declared that she was no enemy and vowed to help the Demon Slayer Corps cut down Muzan while she remained unable to return home.

The Sapphire Star joined the Demon Slayer Corps as a special adviser and observed Tanjiro, Zenitsu, and Inosuke choose tamahagane and receive their Kasugai Crows. After the three set off on their first missions, she prepared to seek intelligence on Muzan and Dire Miralis while hoping to find a way home.

• Kagaya Ubuyashiki welcomed the Sapphire Star as an ally, gave her a Wisteria Crest Token, and promised maps, information, and support through her liaison, Kasumikusa.
• The Sapphire Star agreed that Tanjiro, Zenitsu, and Inosuke should develop independently and watched them choose tamahagane for their Nichirin Blades.
• Tanjiro, Zenitsu, and Inosuke received their Kasugai Crows, while the Sapphire Star accepted a second token and learned she could requisition Corps resources.
• Tanjiro, Zenitsu, and Inosuke thanked the Sapphire Star and left for their first missions, with Inosuke promising to challenge her again.
• The Sapphire Star resolved to get maps and intelligence, hunt for Dire Miralis and Muzan, and find a way back home while threatening Lone Bird if she remained stranded.

The Sapphire Star stopped Genya from attacking Hinaki, then learned that demons were obstructing the Sunshine Mountain ore vein needed to forge Nichirin Blades. She set off to clear the threat, and Kagaya Ubuyashiki summoned the Hashira to meet in three days.

• Genya demanded a Nichirin Blade immediately and reached for Hinaki, but the Sapphire Star blocked him and Kagaya Ubuyashiki calmed him down.
• Hikigusa gave the Sapphire Star information about demons near the Sunshine Mountain ore vein and the resulting delay to Nichirin Blade production.
• The Sapphire Star departed for Sunshine Mountain to eliminate the demons obstructing the ore supply.
• Kagaya Ubuyashiki informed the Hashira about the Sapphire Star, and they reacted to news of her strength and arrival.
• Kagaya Ubuyashiki ordered a Hashira Meeting at headquarters in three days.

The Sapphire Star reached Sunshine Mountain and learned that a demon had been killing miners inside the mine despite the sun and the Scarlet Crimson Ore. She entered the mine alone to find the creature.

• The Sapphire Star crossed the mountain forests and noticed how small and fragile the local wildlife seemed.
• At the mine camp, the logistics officer and foreman told the Sapphire Star that miners and guards had vanished at night and that something had laughed from behind the rock.
• The young swordsman said the demon left no trace and evaded the Corps' patrols, while the miners feared going underground.
• The Sapphire Star told the others to protect the camp, drew the Fatalis Demolisher, and entered the mine.

The Sapphire Star followed agitated Scoutflies through a mine and overcame a demon’s traps and cave-in. The demon fled deeper into the tunnels as the Sapphire Star found her hiding place and closed in.

• The Sapphire Star entered the dark mine and followed Scoutflies past wrecked carts, where she collected strange decay-scented powder from a miner’s cap.
• A hidden demon attacked her with falling rocks and a blast of toxic ore dust, but the Sapphire Star deflected the rocks and froze the dust with her Velkhana Frost.
• The demon caused a cave-in to block the tunnel, but the Sapphire Star shattered the rubble and forced open a passage.
• The demon recognized the Sapphire Star as a terrifying predator, tried to ambush her, and then fled as the Scoutflies exposed her hiding place.

The Sapphire Star pursued and killed Koyuki, Lower Rank Four, then cleared the Sunshine Mountain mine. Kagaya Ubuyashiki and the Hashira learned of her victory, and Kagaya ordered a detailed dossier on her battle and fighting style.

• The Sapphire Star chased Koyuki through the mine and broke through a rock wall to catch her.
• Koyuki revealed herself as Lower Rank Four and attacked with her Blood Demon Art, but the Sapphire Star severed her vine arms and froze her to death.
• The Sapphire Star confirmed the mine was clear and planned to discuss the demons and the Twelve Kizuki with Hikigusa.
• A Kasugai Crow reported Koyuki's death and the mine's recovery to Kagaya Ubuyashiki, who celebrated the victory with Lady Amane.
• Kyojuro, Sanemi Shinazugawa, and Mitsuri Kanroji received news of the Sapphire Star's victory and reacted with admiration, disbelief, and excitement.
• Kagaya Ubuyashiki ordered Hikigusa to compile a comprehensive dossier on the battle and the mine's recovery.

Sapphire Star met the nine Hashira at headquarters, where Sanemi tested her by throwing hot tea at her and questioned her origins. Kagaya persuaded the Hashira to accept her as an ally and let her stay at headquarters, though some doubts remained.

• Kagaya introduced Sapphire Star to the Hashira as an ally of the Demon Slayer Corps.
• Sanemi threw a cup of hot tea at Sapphire Star and demanded to know who she really was, but she caught it and explained that she had helped the Demon Slayers by chance.
• Kagaya welcomed Sapphire Star to stay at headquarters, and she left the courtyard.
• Sanemi, Obanai, and Gyomei questioned the wisdom of trusting a foreigner with unknown powers, while Mitsuri remained uneasy.
• Kagaya cited Sapphire Star's deeds at Mount Fujikasane and the Sunshine Mountain Ore Vein to defend his decision.
• Gyomei accepted Kagaya's reasoning, Obanai fell silent, and Sanemi eased his grip on his sword as the Hashira's tension began to subside.

After an awkward meeting with the Hashira, the Sapphire Star recovered over a huge meal and studied the Demon Slayer Corps' Breathing Style, deciding to ask Kagaya Ubuyashiki about learning it. She settled into the room prepared for her and ended the day feeling more at ease.

• The Sapphire Star left the courtyard after Sanemi Shinazugawa threw scalding tea at her, then found the dining hall and ate four large bowls of food.
• After eating, the Sapphire Star rested near the training grounds and observed the trainees using Breathing Styles, which she compared to Demon Mode and decided she wanted to learn.
• The Sapphire Star peeked at the ongoing Hashira meeting, grew bored, and asked Hikigusa to show her where she would stay.
• Hikigusa led the Sapphire Star to a prepared room, where she unpacked, removed her armor, and relaxed on the tatami.

Muzan fled Asakusa after creating a demon to escape Tanjiro, then returned to the Infinity Castle and summoned the Lower Ranks to confront them over their repeated failures. He declared that their incompetence had begun to bore him.

• Muzan learned that Koyuki had been killed by an Outsider wielding a strange power of frost.
• Muzan encountered Tanjiro in Asakusa and secretly turned a passerby into a demon to cause chaos and escape.
• Muzan abandoned his human family and returned to the Infinity Castle.
• Muzan ordered Nakime to summon the Lower Ranks except the one on Spider Mountain.
• Muzan berated the assembled Lower Ranks and called their existence a disgrace.

The Sapphire Star studied the Demon Slayer Corps’ notes on Breathing Styles and tested the technique in a remote mountain valley, where Sanemi Shinazugawa ambushed her. After their fierce fight, she spared him and left headquarters in anger when he continued to distrust her.

• The Sapphire Star asked Kagaya Ubuyashiki about Breathing Styles, and he lent her the Corps’ inherited notes on breathing and power.
• The Sapphire Star struggled through the old notebooks, then left headquarters at night to practice breathing and her frost and dragon powers in a mountain clearing.
• Sanemi Shinazugawa ambushed the Sapphire Star, and they exchanged attacks as she defended herself and broke through his Wind Breathing techniques.
• The Sapphire Star struck Sanemi with Spirit Thrust and unleashed a Helm Breaker that cratered the ground around him without hitting him.
• Sanemi continued to accuse the Sapphire Star of being a threat, so she gave up trying to convince him and left the area in anger.

After the battle, Sanemi stopped the Sapphire Star from leaving and taught her how to use Breathing with precision instead of brute force. She began practicing his guidance, wondering whether his harsh lesson meant he accepted her.

• As the Sapphire Star tried to leave the valley, Sanemi called her back and criticized her wasteful fighting style.
• Sanemi demonstrated how to sense an opponent’s power, redirect it with minimal force, and gather strength into a focused strike.
• The Sapphire Star understood that she had been relying on brute strength and recognized the efficiency of Sanemi’s technique.
• Sanemi warned her to control her cold and left, threatening to cut her down if she made the same mess again.
• The Sapphire Star began practicing by guiding her power through her body more deliberately and wondered if Sanemi was a tsundere who accepted her.