Slit-Mouthed Woman

Biodata

Power Progression

Background / History

The Slit-Mouthed Woman originated from the Japanese urban legend that spread around the 1970s. Its rules became both her innate cursed technique and her hunting instincts. Over the following decades, she encountered ordinary humans and jujutsu sorcerers who either feared her or attempted to exorcise her 1 3.

Kano was the first person she encountered who appeared to direct emotional attachment toward her. After learning that his mother had died and his father was frequently absent, she interpreted his desperate cries of “Mommy” as a desire for maternal affection. This misunderstanding prompted her to keep him as an entertaining companion rather than kill him immediately 3.

Appearance

Her usual appearance combines a conventionally attractive face with visibly inhuman eyes, skin, and a slit mouth 1 2.

• Hair: Long, glossy black hair reaching her chest, initially hanging over her face 1.
• Eyes: Dark-gray eyes with tiny white pupils 1.
• Skin: Deathly gray or grayish-white, with an unnaturally cold touch 1 3 25.
• Face: An oval face, delicate nose, almond-shaped eyes, and small lips. Slits extend from both corners of her mouth 1 2.
• Stitches: Kano closes her mouth slits with black cursed-energy sutures. These remain part of her appearance and are repaired after combat damage 2 5 21.
• Nails: Sharp, glossy, metallic-black fingernails and toenails 1 4.
• Usual clothing: A brown raincoat or trench coat, straight-leg trousers, modestly heeled black footwear, and a white mask 1 6.
• Later clothing: Adopts nightdresses and slippers at home, and casual summer outfits while traveling, including a baseball cap, fitted jumpsuit, and rhinestone sandals 4 25 32.
• Scent: A cool fragrance combining green tea, sandalwood, and a faint trace of rotting wood 2.

Personality

Initially a patient predator, she enjoys having helpless prey trapped within her technique. Her confidence is vulnerable to embarrassment: Kano’s unexpected maternal address, clinginess, and compliments repeatedly distract her from maintaining control. Anxiety about her appearance is part of the premise that created her, making insults to her beauty personally aggravating 1 2 21.

Her attachment to Kano combines teasing, manipulation, and genuine care. She demands affectionate forms of address, invades his privacy, and treats him as a pet or child, but also apologizes after upsetting him, brings peace offerings, and worries about his injuries and reckless decisions. Her protectiveness remains possessive: she insists that his life belongs to her under their vow 5 6 13 47.

She is curious about human life and persistent when challenged. Cooking, shared meals, sightseeing, and simulated sleep become pleasures in their own right. When advanced barrier theory exposes gaps in her education, she studies the necessary subjects rather than abandoning the material 4 6 27 32.

Abilities & Skills

Scissors-Based Cursed Technique

Her innate technique manifests cursed-energy scissors and produces cutting attacks 2 21.

• Cuts Kano’s cursed-energy threads with a conjured pair of metal scissors 2.
• Snipping at empty air creates wounds on a target caught by Forced Q&A 21.
• Can cut objects remotely, including Kano’s phone, without physically touching them 27.
• Can activate cuts with a scissor-like finger gesture, used against Xiao Zhou’s trousers and a leech-shaped curse 31 38.
• Strong cursed-energy reinforcement can reduce her attacks to superficial damage; both Geto and Chúgǒu withstand repeated cuts 21 44.

Simple Domain: Forced Q&A

Forced Q&A combines her innate cursed technique with a barrier that imposes the rules of her beauty question 2 20 44.

• Opening condition: After establishing the domain and designating a target, she asks, “Am I beautiful?” Both parties normally enter mutual inviolability until the target answers 2.
• Legend-based outcomes: She intends to slit the mouth of someone who calls her beautiful and kill someone who denies her beauty 1.
• Combat use: Traps Geto and Chúgǒu, restricting their actions and creating opportunities for cutting attacks 20 43.
• Output adjustment: Uses additional binding vows to strengthen her attacks against Geto, sacrificing domain duration and loosening the barrier 21.
• Cooperative attacks: Her altered barrier permits Kano’s blade waves to enter from outside while Geto remains occupied resisting her technique 21.
• Resistance: A sufficiently powerful opponent can erode or forcibly break the domain through cursed energy 20 43 44.
• Recovery: It lacks the mental landscape of a complete innate domain and does not cause cursed-technique burnout. Reuse requires gathering cursed energy and waiting through a cooldown 44.
• Exceptional disruption: Kano’s unconventional responses and her emotional distraction undermine its normal operation during their first encounter 2.

Barrier Techniques

She possesses a practical foundation in barriers before receiving Kenjaku’s advanced teaching materials 5 24.

• Maintains a protective barrier around Kano’s home and instructs him to remain inside it while she investigates Hiroshi’s illness 8 26.
• Alters an ordinary observer’s perception of her appearance: Mr. Tanaka sees a young married woman resembling Kano rather than a stitched-mouth cursed spirit 25.
• Learns through comparison with her own Simple Domain, then develops mathematical explanations using coordinates, vectors, and energy-transmission paths 27.
• Initially struggles with advanced theory because she lacks systematic mathematics and science training. Her solution is to study only the topics needed to understand Kenjaku’s notes 27.
• Kenjaku can leave a package at the house without triggering her barrier 26.

Cursed-Energy Absorption and Dual Cores

She replenishes and strengthens herself through fear, resentment, cursed energy, and human consumption 6 14 21 32.

• Absorbs the negative emotions produced by spectators and gamblers at a racetrack 14.
• Feeds on Megumi’s negative emotions and cursed energy, and later consumes historical resentment around the Pearl Concubine Well 16 32.
• Drinking a small amount of Geto’s blood restores at least sixty percent of her strength after their exhausting fight 21.
• Can recover some energy scattered by an exorcised curse, but cannot simply assimilate Rainbow Dragon wholesale because their origins differ 20.
• Human food supplies less than one ten-thousandth of the energy obtainable through spreading fear and hunting humans 6.
• To activate both cores, she first draws a trace of Sukuna’s power into her original core. Omitting that step leaves her using only her original power 27.

Perception and Cursed-Energy Control

Her senses and control support investigation, concealment, and domestic tasks 5 8 13.

• Identifies Hiroshi’s illness as a life-draining innate cursed technique and estimates that he will die within a week if it continues 8.
• Detects and extracts unfamiliar cursed energy used to track Kano 13.
• Suppresses her presence well enough to approach Kano unnoticed 13.
• Manipulates small objects at a distance, opening a medicine kit and sending bandages to Kano 5.
• Suppresses Kano’s unstable cursed-energy surge during an argument 6.
• Senses negative emotions and goodwill even when she cannot understand the speaker’s language 31 37.
• Uses her cold cursed-energy aura to keep Kano and Xiao Zhou comfortable in summer heat 32.

Physical Combat and Limitations

She relies on cursed-spirit strength, a polearm, and tactical openings rather than refined martial technique 19 20 44.

• Uses the Wrongful Death Blade as a vaulting pole to reach Rainbow Dragon, then wedges its blade between his scales and anchors herself with cursed energy 20.
• Conserves energy against Rainbow Dragon so she can reserve Forced Q&A for Geto 20.
• Can sever Chúgǒu’s arm with a blade attack, but struggles against the wolf curse’s superior close-combat skill and strength 44.
• Cannot fly naturally and initially has limited area-attack options 16 19 29.
• Recognizes Geto’s Cursed Spirit Manipulation as a threat that could result in her absorption 16.
• Reverse Cursed Technique output is harmful to her; she evades Shoko’s attempted treatment after the wolf battle 46.

Domestic Skills

• Learned to cook by observing humans; prepares breakfast and shared meals for Kano 4 6 9.
• Convincingly impersonates his parent when requesting school leave and speaking with his teacher 9 25.
• Teaches Kano barrier fundamentals using demonstrations, a whiteboard, and mathematical diagrams 27.

Binding Vows

Equipment / Weapons / Items

• Wrongful Death Blade — Special-grade cursed tool that converts supplied cursed energy into blade waves with a splash effect, compensating for her limited area attacks. It can take the form of a long-handled scythe with a skull ornament. She hides it when Toji requests his weapons back and continues carrying it afterward 19 24 42.
• Visibility cursed tool — A pair of eyeballs, one black and one white, supplied by Kenjaku and merged into her body. Allows her to choose whether ordinary people and standard cameras can see her; also serves Kenjaku’s monitoring purposes 26.
• Thread ring — Made by Kano and worn on her right ring finger as a token of their binding vow. She gives him a cursed-energy-infused silver ring in exchange 4.
• Miyano Yuko identification — Kenjaku supplies documents, including a passport and health insurance card, enabling her to travel under a human identity 26 28.
• White mask — Conceals her mouth slits and stitches; habitually worn in public 1 31.

Relationships

• Shoichi Kano — Binding-vow partner and chosen “child.” Their relationship develops from attempted murder into shared domestic life and battlefield cooperation, without removing her conditional threat over him 1 3 21 47.
• Hiroshi Yamakawa — Kano’s friend. She diagnoses his supernatural illness and agrees to investigate after making Kano beg for assistance 8.
• Toji Fushiguro — Temporary employer and weapons supplier. His complete absence of cursed energy fascinates her, but he rejects her attempt to touch him and dismisses her request for additional tools 14 16.
• Suguru Geto — Initially an enemy whom she and Kano defeat through attrition. They later cooperate against Chúgǒu and socialize in Hailar, though mutual suspicion persists 21 40 44 48.
• Shoko Ieiri — A sorcerer she comes to regard warmly because Shoko lacks intense hatred toward curses. She tries to protect Shoko during battle and later joins her in a drinking rivalry 43 48.
• Kenjaku — Dangerous benefactor and binding-vow partner. Kenjaku supplies power, knowledge, identification, and travel resources while directing and monitoring their mission 24 26.
• Megumi Fushiguro — Briefly comforts him after Toji leaves, while secretly feeding on his distress and cursed energy 16.
• Xiao Zhou / Little Zhou — Beijing guide and eventual sightseeing companion. His Douzhir prank provokes her retaliation against his trousers 30 31 32.
• Bai Guangzhi — Holder of the time-related cursed tool she seeks. She recognizes the grief behind his obsession, but later suggests killing him before Kano chooses negotiation instead 36 50.

Story Role / Major Arcs

Encounter and Conditional Motherhood

• Traps sixteen-year-old Kano on an unfamiliar street and begins her beauty-question routine. His panicked “Mom” interrupts the encounter 1.
• Kano’s newly awakened Thread Manipulation removes her mask and stitches her mouth slits. Her confusion gives him time to escape 2.
• Follows him home through an open bathroom window, establishes their three-month vow, and begins living as his self-appointed mother 3 4.

Hiroshi’s Illness and Q Organization

• Investigates Hiroshi’s life-draining curse and helps Kano trace its source 8 9.
• Reassures Kano after he kills the responsible curse user, promising to reach him within ten minutes 10.
• Accompanies him into dealings with the Q Organization and demonstrates that the organization has placed tracking energy on him 12 13.

Star Plasma Vessel Incident

• Joins Toji’s operation and enters the Tombs of the Star Corridor concealed inside his Inventory Curse Worm 16 18.
• Fights Rainbow Dragon, then traps Geto in Forced Q&A. She and Kano exhaust him through repeated cuts and attacks from outside the domain 20 21.
• Leaves Geto alive at Kano’s insistence and departs with the unconscious but surviving Riko Amanai 21.
• After Kenjaku prevents their escape with Supergravity, accepts a new bargain for power and barrier knowledge 24.

China Mission

• Travels as Miyano Yuko, posing as Kano’s mother and guardian. In Beijing, the pair sign an agreement prohibiting supernatural ability use and are asked to notify the authorities before leaving 28 30.
• Spends a week sightseeing before continuing toward Inner Mongolia. Supports Kano after his supposedly friendly match with Cheng Shan turns dangerous 32 33.
• Helps remove and destroy the leech-shaped curse controlling Huang Chang, uncovering warnings about an approaching “Khan” 38.

Chúgǒu and the Clock Search

• Reunites with Geto and Shoko during sightseeing, then joins them against Chúgǒu, who threatens to devour her 40 42.
• Uses Forced Q&A to disrupt the Shadow Wolves and helps occupy Chúgǒu while Geto prepares Maximum: Uzumaki 43 44.
• Survives the collapsed Shadow Wolf Tomb domain, then confronts Kano over his life-threatening gamble during the battle 46 47.
• Resumes the cursed-tool mission and studies Bai Guangzhi’s inactive Taiji Bagua formation surrounding a Western-style clock 50.

Notable Quotes

“Am I beautiful?” 1

“Humans have no power of flight, yet technology lets them soar through the sky. But if we aren't born with a flight-related cursed technique... the sky is forever beyond our reach.” 29

“Our Binding Vow dictates that even if you die, baby, you can only be killed by Mom. You're mine.” 47

Trivia

• Does not need sleep, but simulates dormancy to match Kano’s schedule and enjoys being wrapped in blankets 6.
• Retains a humanlike gag reflex despite being a curse; Douzhir makes her violently dry-heave 31.
• Removes her mask in public without activating her technique for what is arguably the first time while eating in Beijing. The diners interpret her mouth stitches as ordinary scars 31.
• Handles strong local alcohol far better than Kano and Geto, and drinks whiskey early in the morning 47 48.