After the death of his father, Yuichi goes to live with his
father's ex-wife, Yukiko. Yuichi doesn't know much about
Yukiko, until he finds a video tape showing his father
having sex with her. Yukiko has a daughter Mika; from a picture she saw of Yuichi she already has a crush on him. It quickly grows into obsession. She wants to be with him.
All this confuses Yuichi. What will he do?