Living together with her stepson Yoshio, Sayuri finds herself increasingly aware of him as a man, struggling with confusing desires she can no longer suppress. Yoshio, too, harbors secret feelings for Sayuri, and though tempted by advances from his classmates, he finds himself consumed by jealousy and fantasies of his mother's seductive behavior. As their forbidden emotions intensify, the two teeter on the edge of crossing an unthinkable boundary.