The summer beach that she couldn't go to with her husband. Yumiko was looking forward to this day and was excited about it. But when her husband couldn't come, she went to the beach alone with her young son. Just as she was feeling down, two young men called out to her. That night, Yumiko was invited to the room of the men who had picked her up that day. She put her son to bed and, with secret hope in her heart, headed to the room where the two young men were waiting. A forbidden summer begins, as she is tormented by guilt but indulges in carnal desire...