Inraku no Ketsuzoku -Kindan no Jubaku-  

 淫落の血族 ～禁断の呪縛～

Hayato is a high school student and lives at a school dormitory. One day, he hears of his father's death and comes back to his hometown. What waits him there are his mother, older sister, younger sister, and aunt and he is told to stay there for a while.... However, there is something strange about him that he has an erotic dream every night, having sex with his family members.... One day, his mother tells him, "Have sex with your family members and make them pregnant."