Onigawara Rin

Biodata

Power Progression

Background / History

Childhood and academy life

Rin’s father eloped with his lover, and her mother resented how closely Rin resembled him. Her mother forced her to wear a demon mask from childhood. Rin continued wearing it after leaving home to live at school, treating her face as something shameful 6 7.

At Aichi Kyosei Academy, she became one of the Five Heavenly Swords, whose authority rested on martial strength. Her daily responsibilities included correcting boys and maintaining order. Nonon Mozunoya accompanied her on patrols and learned swordsmanship from her 6 8 14.

Encounter with Haimo

Rin confronted Haimo after seeing Sasamori Aya following him. Frightened by his presence, she nevertheless attacked with Dragon Tail Reversal. Haimo redirected the strike with Mozunoya’s expandable baton and stopped its tip immediately before her mask, demonstrating that he could have killed her 6 7.

Haimo identified her fear of being seen as an obstacle to her swordsmanship. When she refused to remove her mask, he shattered it, then restored it with divine power. Humiliated but increasingly curious about his offer of another world, Rin followed him 7 8.

She subsequently detected Nemumeno Satori hiding behind gymnastics mats during the gathering of prospective recruits. Despite the danger of leaving her old life, Rin committed to going with Haimo because she wanted to change. Before departing, she urged Mozunoya to become independent and entrusted the academy to her 11 13 14.

Becoming an adventurer

After arriving in Orario, Rin was captivated by the expensive Black Crow sword. Tsubaki later allowed her to choose it at Hephaestus’s armory, and Rin immediately claimed it 18 19 30.

Her early Dungeon battles produced rapid growth, but also exposed the limits of her equipment. Following a Monster Party on the thirteenth floor, she discovered chips along Black Crow’s edge and anxiously handed it to Tsubaki for inspection 75 105.

When offered the choice between leveling up and continuing to chase Aya’s statistics, Rin chose steady growth and the ability to protect her companions over risking her life. Haimo supported that decision and guided her toward Swordsman as her first development ability 140 141 142.

First rescue of Lili

Rin intervened when Soma Familia adventurers were extorting and beating Lili. Though unarmed, she defeated the attackers with punches, kicks, and a pebble. Lili remained suspicious of her intentions and refused further assistance 161 162 164.

The confrontation left Rin worried that she had endangered Haimo’s reputation by interfering in another Familia’s affairs. Tsukuyo Inaba also explained that conspicuous outside help could lead to further retaliation against Lili. Rin reluctantly withdrew, then confessed the incident to Haimo without excuses and asked to be punished 165 168 169.

Return to the academy

On a return visit, Rin reunited with Mozunoya and demonstrated her new precision by splitting a falling petal with a dead twig. She explained that her goal was now to become strong enough to protect everyone and meet Haimo’s expectations 174 175 177.

When Mozunoya asked to join her in Haimo’s world, Rin made no promise of admission. Instead, she promised to speak to Haimo if Mozunoya could demonstrate sufficient improvement by their next meeting 177 178.

Senior Familia member

After adapting to Level 2, Rin reported that the party could handle the Dungeon down to the fifteenth floor with ease. She subsequently helped welcome Seitenshi and the other newcomers, offered practical sword-training advice, accompanied their Dungeon outings, and took them shopping for necessities 266 267 269 320 342.

Rin later joined Tsukuyo and Aya in rescuing Lili from another Soma Familia beating. This time, she acted on Haimo’s instruction not to ignore injustice out of fear of worldly rules. She defended Lili against Aya’s contempt, accepted responsibility for the fight, and helped bring her into the Familia’s care 351 352 365.

Appearance

Rin is petite, with short black hair, red eyes, and a delicate, doll-like face 75 160 168 175.

• Hannya mask: Her most recognizable accessory; she wears it over her face, pushes it onto her head, or carries it at her waist 56 105 160.
• Clothing: Wears a practical black hunting outfit with a red sash or ribbon; later also appears in lightweight swordsman’s clothing 160 161 265.
• Build: Years of sword training have given her toned arms, firm muscle definition, and faint abdominal lines 289.

Personality

Rin is upright, rule-conscious, and quick to oppose bullying. Her instinct is to help someone in danger regardless of Familia affiliation, but her first experience with Lili forces her to confront the possibility that a well-intentioned intervention can provoke retaliation. She takes responsibility for her own impulsiveness rather than concealing it or shifting blame 13 161 165 169.

She is also competitive and easily embarrassed. Comparisons with Aya and Mary motivate her, while Haimo’s praise visibly reassures her. Although she resents falling behind Aya, she ultimately recognizes that their paths need not be identical and chooses sustainable growth over self-destructive imitation 25 75 140 141.

Her stern manner often gives way to social awkwardness: she struggles with Seitenshi’s formal greeting, hesitates before offering friendly advice, and becomes flustered over her feelings for Haimo. She also treasures swords intensely, insisting that they have souls when Aya dismisses Black Crow as merely a tool 105 196 267 269 305.

Abilities & Skills

Kashima Shinden Jikishinkage-ryū

Rin practices a traditional sword school that joins technical training with discipline of the heart and courage 6.

• Dragon Tail Reversal: A secret technique centered on a fast, precise sweeping slash, described as capable of cleaving steel 6.
• Mental discipline: The school’s “Ten Evils” prohibit character flaws including arrogance, greed, and fear. Haimo initially judges Rin’s avoidance and unsettled mind to be undermining her technique 6 7.
• Precision: After gaining Falna, she can divide a falling petal cleanly with a dead twig 177.

Clear Mirror Sword Heart

A skill that rewards a calm, focused state of mind 142.

• Increases Dexterity and Agility more strongly as her concentration and composure improve.
• Greatly increases slashing power when her mind reaches the ultimate state of emptiness 142.

Sealed Heart Sword Soul

A skill that turns Rin’s mask into both a seal and a switch between combat states 142.

Swordsman

Rin’s first development ability, acquired at rank I upon completing her Level 2 advancement 142.

• Greatly increases the power of sword-type weapons.
• Recommended by Haimo because it complements the slashing-focused nature of both her skills 141 142.

Unarmed Combat

Rin remains dangerous without a drawn sword 161.

• Uses punches, side kicks, and a stance intended for catching blades barehanded.
• Overwhelms low-ranking Soma Familia adventurers through Level 2 speed and strength.
• Can also fight with Black Crow still sheathed, using it to strike rather than cut 161 352.

Equipment / Weapons / Items

• Hannya mask — Originally imposed on her by her mother. Haimo shatters and restores it during their first confrontation; it later serves as the switch for Sealed Heart Sword Soul 6 7 142.
• Famous Sword: Black Crow — A jet-black tachi with cloudlike forging patterns, originally displayed for 3,800,000 valis. Forged by a senior Hephaestus Familia smith from middle-floor Obsidian Steel, it has exceptional hardness and enhances slashing attacks. Its edge chips during the thirteenth-floor Monster Party, prompting Tsubaki to inspect it 18 30 105.
• Haimo-forged tachi — Later wields a dark-bladed, first-class weapon personally forged by Haimo. After cutting down three Hellhounds, she finds no sign of the edge rolling 375.

Relationships

• Haimo — Patron deity and trusted guide. Rin seeks his approval and advice, credits him with opening a broader world of swordsmanship to her, and develops romantic interest in him. Her jealousy eventually drives her to compete with Aya for a place beside him overnight 75 141 177 196 305.
• Tsukuyo Inaba — Close companion whose judgment Rin respects. Tsukuyo tempers her impulsiveness after the first Lili rescue and later stands beside her when they intervene again 160 165 351 352.
• Sasamori Aya — Former academy opponent and continuing rival. Rin admires her strength but disputes her disregard for weapons, safety, and weaker people 6 105 106 140 265 352.
• Kikakujō Mary — Competitive peer and fellow swordswoman. Their rivalry helps push both toward difficult decisions, including leaving the academy and receiving Falna 13 25 143.
• Nonon Mozunoya — Devoted junior and swordsmanship pupil, whom Rin calls “Nono.” Rin encourages her independence and promises to advocate for her recruitment if she becomes strong enough 13 14 177.
• Tsubaki — Equipment adviser and encouraging senior. She helps Rin obtain Black Crow, examines its damage, and reassures her about both her growth and her appearance 30 67 75 105.
• Seitenshi — Newer Familia member whose elegance initially intimidates Rin. Their relationship warms when Rin offers hand-protecting bandages and invites Seitenshi to address her simply as “Rin” 267 269.
• Lili — Supporter Rin rescues twice from Soma Familia abuse. Rin remains concerned for her despite Lili’s initial distrust and later defends her against Aya’s harsh judgment 161 164 320 352.

Notable Quotes

“I've already... made up my mind to change.” 13

“Swords have souls!” 105

“Strong enough to truly protect everyone, strong enough... to live up to God's expectations.” 177