Ritsuko Hasekura, an English teacher and swimming club advisor, balances a confident, education-focused demeanor with a professional approachability. She stands tall at 171 cm, her athletic, slim frame accentuated by a G-cup bust and measurements of 98-61-94 cm. Her blond hair cascades in a middle-parted ponytail, framing cyan eyes that mirror her composed authority.

Her wardrobe leans toward provocative choices—bunny dresses, fishnet pantyhose, latex accents, and artfully torn garments—often entangled in coercive contexts. Compromising situations force her into bunnygirl cosplay, including a documented incident where a concealed vibrator beneath mesh panties triggered public loss of control amid students.

A former elite swimmer and multitalented educator, her reputation unravels through manipulation and blackmail stemming from comparisons between the protagonist and his stepbrother. Retaliation escalates to physical assault, systematic degradation, and public humiliation, with encounters deliberately recorded.

Her arc plunges from respected authority to exploited target, marked by bondage, coerced roleplay, and psychological games. These ordeals expose fractures in her steadfast exterior, though documented sources omit definitive resolutions to her fractured trajectory.