The summer sea I couldn't come to with my husband. Yumiko had been looking forward to this day and was really excited. Her husband couldn't make it, so she went to the beach alone with her young son. Two young men approached her while she was feeling dejected. That night, Yumiko, who had been invited to the room of the men who had picked her up during the day, put her son to sleep and headed to the room where the two young men were waiting, with secret expectations in her heart. A forbidden summer begins, as she indulges in carnal desire while tormented by guilt...