Keisukes 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 familys liquor business and be married to the daughter of his fathers former colleague. However, Keisukes 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 Keisukes fiancés family comes to meet with them. Misaki shows her desire for Keisuke and they mutually surrender themselves to each others flesh.

Keisuke must choose between a normal and successful life, or to follow his desires and submit himself to their forbidden relationship.