After the death of his father, Yuichi comes to live with his stepmother, Yukiko. Yuichi doesn't kow much about Yukiko, until he finds a video tape showing his father having sex with her. At his new home, Yuichi meets Mika, his step-Sis, Mika, having seen Yuichi's photo, is already in love with him. That night, Yuichi can't help but watch that video again, masturbating as he sees his stepmother and father get it on. Tha's when Mika enters his room, she tell him how she's been in love with him for a long time. Stripping off her clothes, she asks Yuichi to make love with her. Embarrassed and confused, he rejects her. Mika runs
...Read More from the room and comes back with dozens of video tapes. Yuichi is shocked when he finds out that every single video tape shows Yukiko having sex with some new guy.