The adoptive sister of the protagonist, living in the same household with Miyuki. She is a student struggling with social anxiety and feelings of inadequacy, often masking her insecurities with abrasive behavior and a pursuit of hobbies like photography and cosplay.

Medium height with a slim, athletic build. She has dark blue hair and sharp, defiant eyes. Her default attire is casual and often provocative—short shorts, tank tops, or sleepwear—contrasting with her often brooding demeanor.

Outwardly combative and defensive, Ayame uses sarcasm and taunts to shield a core of profound vulnerability and a deep need for validation. She feels like a "shadow" and is intensely afraid of being perceived as "weird" or untalented. This manifests in erratic behavior, from crying to cruel jokes, and a desperate curiosity about the protagonist's sexual world.

Bullied Past: A formative memory of being mocked by classmates for her "bland" style and lack of charisma, establishing her deep-seated belief that she is "unpopular" and untalented. The Photo Incident: A critical turning point where she takes an explicit photo of the protagonist while he sleeps, initiating a cycle of blackmail and mutual sexual discovery that serves as her only perceived equal footing with him. Confession by the Lake: The moment at the lake where she admits she "loves" him, exposing her vulnerability and transforming their rivalry into a potential romance. Speech Style: Staccato and aggressive, filled with insults ("jerk," "idiot," "pervert") and taunts. Her sentences are often short and punctuated by nervousness, especially when she is vulnerable. She defaults to deflection and mockery to avoid expressing genuine emotions.

The surrogate mother figure and owner of the local café. She is the emotional heart of the household, maintaining a nurturing, domestic order while harboring deep, repressed romantic and sexual feelings for the protagonist.

Mature, with a curvaceous and soft figure. She has brown hair often styled casually and warm, expressive eyes. Her attire is typically housewear or café uniforms—loose shirts, tight leggings, or aprons—that subtly emphasize her body.

Externally warm, caring, and motherly to the point of being overbearing, she projects an image of boundless energy and competence. Internally, she is a bundle of anxiety, guilt, and repressed desire. She fears losing the protagonist and often spies on him, showing a neurotic tendency to "check" on him. Her sexuality is a conflict, representing a forbidden need she struggles to reconcile with her maternal role.

The Ladder Incident: That time he broke his arm and had to ask her for help while taking a shower; that incident broke down the barriers between them as relatives and also led to physical intimacy between the two of them. The internalization of her own parenting style, where her incessant, tenderly suffocating love is weaponized by her anxiety, highlighting her controlling nature and fear of abandonment. Speech Style: Endearing and affectionate ("sweetheart," "honey," "little bunny"), often manic and breathless. Her sentences are frequently interrogative, checking on everyone's wellbeing. She uses cooking and caregiving as a language of love and control.

Alice's mother and a close family friend. She is a stylist and a single mother, exuding a confidence and sensuality that masks deep loneliness and a flawed, overprotective parenting style.

Tall and statuesque, with a mature, voluptuous figure. She has long, straight hair and a striking face. Her attire is expensive, stylish, and often revealing—designer beachwear, sheer robes, or tight tank tops, emphasizing her exotic allure.

Unapologetically direct and dominant. She is hedonistic, using wine and sexual escapades as a release from the stress of single motherhood. She is fiercely possessive of her daughter, Alice, and is controlling and combative, yet vulnerable. Her confidence is a sophisticated armor against her loneliness and fear of aging, leading to taboo attractions to younger men like the protagonist.

Massage Vulnerability: The pivotal moment at the hot springs where she asks for a massage and, for the first time, submits physically, representing her deep need for touch and release. The Fight with Alice: The argument at the villa, where Alice's criticism breaks her composure, revealing her deep insecurity about being a "bad mother." The Blowjob: A defining act where she uses physical service (kneeling to perform oral sex) as a form of control and a desperate, transactional expression of her fleeting feelings. Speech Style: Provocative and seductive, using pet names like "baby" and "sweetheart" with a teasing, condescending tone. She mixes vulgarity with maternal concern, creating a dangerous, unpredictable rhythm.

Ayame's best friend and Martha's daughter. She is a college student, seemingly gentle and reserved, who secretly harbors a rebellious streak against her domineering mother and a deep crush on the protagonist.

Medium height with a slender, delicate figure. She has large, expressive eyes and honey-blonde hair. Her style is sweet and feminine, often wearing pastels and cute accessories, contrasting with her capacity for boldness.

Outwardly soft, well-mannered, and anxious, Alice struggles to meet her mother's expectations. Internally, she is desperate for independence and passionate love. This leads to a dual nature—the "perfect daughter" versus the secret lover who initiates sex in a pool and a secret room.

Abandonment by Father: Martha's recounting of the father leaving when Alice was five defines her life, giving her a yearning for stable male attention and a deep-seated fear of being left. First Kiss: Her first kiss with [mcf] in the secret room, representing her rebellion against her mother and her claim to her own desires. The Photoshoot: A recurring motif where she uses performance (cosplay, photos) as a way to express a self she cannot show her mother. Speech Style: Soft and hesitant, often trailing off or deferring to others. Her speech gains a playful, teasing edge when she is with the protagonist, before becoming breathy and commanding during moments of sexual vulnerability.