45-year-old Yukari's relationship with her husband has completely deteriorated, causing her to increasingly focus her affection on her son. Amid this twisted daily life, she finds herself accepting even the most selfish of her son's requests, always responding with a gentle smile. As her son's desires gradually escalate, he begins treating her as a mere sexual object. Yet Yukari rediscovers the pleasures of being a woman and continues to pour her love onto her son. In return, her son rewards her by filling her with his thick, copious sperm, unfolding a bizarre and intense relationship.