Rinko lives with her son Makoto, as her husband is working away from home. One day, she sympathizes with Makoto's classmate Yuki and starts to treat him kindly... Yuki, who is secretly filled with desire, takes advantage of her kindness and forces himself on her. Rinko feels guilty about having sex with her son's classmate, but her body, which has not felt anything in a long time, cannot contain its excitement. Her body seeks pleasure as he relentlessly plays with her, gradually awakening her inner carnal desire...