This hentai OVA is a spin-off anime adaptation of the popular Lilith visual novel "Tsuma Netori: Onna Kyoushi no Choukyou Nisshi" (Wife Stealing: Female Teacher's Training Journal). Produced by TEATRO Nishi Tokyo Studio (known for intense training scenes in projects like the Taimanin Yukikaze bonus), it delivers heavy NTR (netori/wife stealing), corruption, and sadistic domination.

Newly transferred married PE teacher Haruhara Ikumi searches for her disappeared best friend and suspects colleague Anno Shirou. Caught while investigating his desk, she is knocked out and taken to a hidden torture room in the abandoned school wing. There, Shirou — aided by the new character Tanba Gouzou — begins her systematic breaking. What starts with restraint and verbal abuse escalates into intense bondage, violation, anal torment, public humiliation, and double penetration as Ikumi fights desperately to protect her family and dignity.

The story explores themes of moral collapse, blackmail, and the slow descent from proud wife/teacher into a broken pleasure slave. With high-quality animation focused on detailed erotic torment (roughly 70% of runtime is explicit), this is pure dark NTR training for fans of ugly bastard, mind break, and wife corruption.