Haru is a rather cool fifth-grade elementary school student who shares the same tastes as her mother’s younger sister Yuko (Kaho) and can tell Yuko what she really feels. On the first day of the summer vacation, Haru is kidnapped. The culprit is her free-spirited father Takashi who disappeared from home two months ago.

Kaiji is about to have his life changed. The thrill is beyond anything he, or most people, have experienced. The adventure is not without risk and danger however. He is given four games, which are challenges, and include life and death situations.

While police investigate a woman found dead in a derelict love hotel, a romance novelist's wife lives a life that seems simply a daily repetition without romance. To escape the loveless monotony, she follows her desires and becomes a nude model. Soon, she meets a mentor and begins selling her body to strangers, while at home, she hides behind the façade of the doting wife.