"Sasa Harumi," a lesbian woman who experienced heartbreak in Tokyo, returns to her birthplace—a southern island—to heal her emotional wounds. She decides to spend her entire summer vacation there, starting from the first day of August.

While enjoying her summer holiday, she is plagued by inexplicably lewd dreams every night. Within these dreams, her psyche grows increasingly unstable. Gradually, the line between dream and reality blurs, until she ultimately withdraws into herself and abandons reality.