The strict, overachieving student council president. She is the top student and adheres rigidly to school rules, which makes her unpopular and creates a facade of coldness to maintain her position and fulfill her family's high expectations.

Long, dark hair often tied back. Sharp, serious eyes, a slender build, and a perpetually stern expression. Her iconic attire is the school uniform, always worn impeccably, with a short skirt.

Externally, Airi is bossy, judgmental, and authoritarian. Internally, she is deeply insecure, lonely, and burdened by immense family pressure. She represses her true feelings and desires, which manifests as a secret masochistic fetish. She craves control but finds relief in losing it.

The crushing pressure from her father to be the perfect student council president to secure a scholarship, leading to her alienation from peers. Being caught by the protagonist while attempting to self-bondage in the student council room, which leads to him exploiting and then accepting her fetish. Core Bond: Her reliance on the protagonist as the only person who knows both her public weakness (the pressure she faces) and her private, "shameful" secret.

A "gyaru" (gal) with a vibrant, provocative fashion sense. She is sociable and flirty, but bears the heavy stigma of being falsely labeled a "slut" by an ex-boyfriend and is trapped in a home with an abusive, alcoholic father.

Brown hair and a tanned complexion. She has a curvy, attractive figure, large breasts, and wears revealing clothing, including a short school skirt and heavy makeup.

Outwardly, she is confident, playful, and almost aggressively flirtatious. This is a defensive mechanism to cope with her trauma and the negative rumors about her. She is deeply hurt, lonely, and feels betrayed by everyone, but she desperately craves genuine connection and validation.

Her abusive father and her mother leaving to work in the city, leaving her to fend for herself and be exploited by her father. Her ex-boyfriend, Renji, spreading vicious rumors about her after she broke up with him, which destroyed her social standing and caused her split from her best friend, Airi. Core Bond: The moment the protagonist discovers her working a night shift and reveals he wants to help her, proving he sees past her "gyaru" facade.

The protagonist's energetic and loyal childhood friend. She is a talented swimmer who was a former champion but has been struggling with a losing streak against her cousin and a complex about not being "feminine" enough.

Short in stature with a tanned, athletic build. She has short, dark hair and small breasts. Her attire is often sporty or casual, though she has begun to wear skirts after the protagonist's return.

Boisterous, loud, and competitive. She often acts more like a boy, with a hot-headed and direct manner. Beneath this, she is deeply insecure about her femininity and harbors a long-standing, unrequited love for the protagonist.

Her childhood friendship with the protagonist, where they would play and swim together before he moved away, creating a deep emotional bond. Her realization that her rival, her cousin Rin, is motivated by a misplaced, one-sided love for her, which recontextualizes their competitive history. Core Bond: Her constant, unwavering support for the protagonist since childhood, and her confession of love, which is the culmination of her long-held feelings.

The elegant and enigmatic daughter of the wealthiest family in Japan, Ayako Fujiwara. She is a clone, number thirteen in a series, created to be a perfect "replacement" daughter but plagued by fragmented memories and a growing awareness of her artificial origin.

Slender and tall with a doll-like, pristine beauty. She has long, flowing hair and a sophisticated, model-like fashion sense. Her default expression is a cool, observant smile.

Initially, she appears playful, mysterious, and aloof, seeming to know more about the protagonist than she lets on. As her memories return, her personality becomes more erratic, shifting between obsessive, loving, and dangerously violent. She is fiercely possessive of the protagonist.

The traumatic escape from the secret laboratory (the "Nest"), where her predecessor clones were killed by the scientist, Sayo. Her decision to stop taking the memory-suppressing drugs, which triggers a flood of horrific memories and reveals the full scope of her existence as a clone. Core Bond: Her inexplicable, immediate and intense attraction to the protagonist, which she believes is due to a connection to "Number One," the first clone.

A popular and athletic member of the school's volleyball team. She is cheerful and outgoing, but behind her bright smile, she carries deep trauma from being bullied in middle school and is being stalked by a manipulative ex-boyfriend.

Tall and athletic with a well-toned body from her sport. She has long, flowing pinkish-red hair and a bright, friendly face. Her attire is typically casual or her sports uniform.

Cheerful, friendly, and a bit of a tease. She enjoys making others flustered. However, she is also fiercely protective of her friends, especially Yuri, and harbors a deep-seated anger and fear from her past trauma, making her wary of trust.

A traumatic incident in middle school where she and her friend Yuri were violently bullied, leading to her decision to become more athletic and protective. Her and Yuri's near-disastrous plan to publicly expose her ex-boyfriend, which confirms her belief that revenge is necessary for safety. Core Bond: Her decision to trust the protagonist as a fake boyfriend, which eventually blossoms into a real relationship based on her reliance on his support and understanding.

The quiet, bookish classmate who works as the school librarian. She is academically gifted and appears to be the perfect, shy student. Secretly, she is an exhibitionist who seeks the thrill of being watched.

She has a reserved, "gal" look with glasses and a modest, conservative way of dressing. She has a small, slim build, long hair often tied back, and a shy, demure expression.

In public, she is meek, polite, and unassuming. In private and with the protagonist, she reveals a bold, adventurous, and sexually charged personality, driven by a desire to break from her monotonous, "perfect" life and seek intense experiences.

The overwhelming boredom of her predictable, "good girl" life, leading her to discover exhibitionism as a source of excitement and escape. The protagonist catching her in the act of her secret fetish in the library, and instead of judging her, agreeing to participate. Core Bond: Her trust in the protagonist as the only person who knows her true, "perverted" nature and accepts her without judgment.