Yosuke, Yukari, his stepmother, and Natsuki, his stepsister, visit their summer house. Yosuke secretly loves Yukari and he plans to tell her that he loves her. However, a group of bank robbers suddenly comes into their house. "Well, you're now our slaves. Just entertain us...." Like this, they are confined in a separate room.... Will Yosuke be able to save Yukari and Natsuki...? Also, will Yosuke tell Yukari that he loves her...?