Renketsu Houshiki
Japanese title: 連結方式
Alternative titles: Consolidated System, Method of Coupling
Type: OVA
Source: Manga
Episodes: 3
Status: Finished Airing
Aired: Jan 25, 2008 to Sep 26, 2008
Duration: 27 min per ep
Rating: Rx - Hentai
Studios: Suzuki Mirano
Genres: Hentai

Keisuke's father has informed his mother as well as Keisuke and Misaki that he has been diagnosed with cancer. And so, Keisuke announces that he wishes to inherit the family's liquor business and be married to the daughter of his father's former colleague. However, Keisuke's sister Misaki does not give her blessing to the marriage. They are more than siblings. The both of them cross the threshold and make love all night and on the day that Keisuke's fiancé's family comes to meet with them. Misaki shows her desire for Keisuke and they mutually surrender themselves to each others' flesh.

(Source: BoxTorrents)