The summer beach Yumiko couldn't visit with her husband.

She had been eagerly looking forward to this day, full of excitement. But with her husband unable to come, she went to the beach alone with her young son.

Feeling dejected, she was approached by two young men. That night, invited to the room of the men who had hit on her during the day, Yumiko put her son to bed and, with secret anticipation in her heart, headed to the room where the two young men awaited.

Tormented by guilt yet drowning in carnal desire, a forbidden summer began...