Tatematsu Minoru, a yakuza from the Ishikawa clan that rules the Shinjuku district, has a lovely sister named Akane. He fantasizes about sending her to college and molding her into a lovely young lady. He adores Akane. His feelings for her transcend beyond his feelings for Kanae, his mistress. Nonetheless, Akane is lonely. Now, a new tutor enters her life and appears to be taken with her...