Takeshi Ninno is a college student residing with his stepmother, Fujino Ninno, and stepsister, Shinobu Ninno. While their household presents a facade of normalcy, Takeshi privately endures an ongoing sexual relationship with Fujino, compelled against his wishes. He experiences significant distress from these forced interactions and desires to end them. Takeshi's motivation to continue stems from his concern that Shinobu would react negatively upon discovering the affair, indicating a desire to preserve their relationship. This strained situation grows more complicated with the unexpected return of another stepsister, Fumino Oshino, adding further tension to the family dynamic. Takeshi is a teenage male characterized by brown eyes and brown hair cut to ear length.