Shiiku x Kanojo

Oominato Natsuko looks younger than she is, but she is a working college student past twenty: open-faced, diligent, and newly attached to a sloppy boyfriend named Shibata. Neighborhood shut-in Wakasa Souji has watched her from a distance for years. When he decides Shibata is a “lust demon” who has already stained his angel, he stops watching. After her shift he takes her home, locks her in a box, and recasts kidnapping as holy work. Fresh semen, he insists, is the only medicine that can restore her.

Natsuko begs to leave. She names her captor out loud and screams for rescue. Wakasa treats every protest as proof she is still deceived. Over four short OVAs the “purification” schedule hardens: bondage and isolation, then structured training, then a break in her speech and smile, then a last run of extreme play—watersports, ice, costume sex, fisting—sold as ritual cleansing. Official copy frames the last chapter as a failed exorcism. The angel does not go home. She tilts into a fallen-angel register, and the series closes on that collapse rather than a rescue.

Adapted from a multi-year breeding sim, the anime compresses the game’s long cohabitation into a single-girl descent. Character design is by citizen08; Natsuko is voiced by Momoi Ichigo. The tone is fetish-forward hentai, not romance: confinement, grooming-as-salvation rhetoric, and a heroine whose body and mind are rewritten on camera.