One day Yuto runs into a stranger in the street and when he comes to, he discovers that the stranger has dropped a videotape. Yuto is no fool and decides to take it for himself, but when he comes home and runs it, he finds on it a tape in which he himself sexually abuses his sister Yumi. Yumi herself soon looks through the tape too and sees her own sexual fantasies. Where will their worlds lead them, where they can do what they wouldn’t dare to do in normal life? Watch and find out!