Gibomai
English title: Step Sister
Japanese title: 犠母妹
Alternative titles: Stepsister
Type: OVA
Source: Visual novel
Episodes: 2
Status: Finished Airing
Aired: Oct 25, 2002 to Mar 28, 2003
Duration: 28 min per ep
Rating: Rx - Hentai
Studios: Mook Animation
Producers: Discovery
Licensors: Critical Mass Video
Genres: Hentai

A renowned painter dies of heart disease while being married with Megumi, a woman much younger than he is. His son, Kyosuke, never liked that union and wants Megumi out of the house. Therefore Megumi proposes that Kyosuke can do anything he wants with her daughter Yuna, Kyosuke's stepsister, if he allows them to stay. Naturally, Kyosuke accepts.

(Source: AniDB)