Naisho no Yoshuu

A hidden relationship exists between two people, unknown to others. He begins a "secret practice" with his best friend's girlfriend, engaging in acts like kissing and holding hands. These actions are meant as preparation for a future relationship with his actual girlfriend. Despite understanding the wrongness of his actions, he is unable to stop due to his desires. The story portrays the overwhelming and uncontrolled impulses of youth. It is presented as an unusual and inappropriate romantic comedy.