A few years after her divorce, Mina has been raising her only son, Tatsuya, on her own. The two have struggled through life together as a single mother and her son, but after seeing his mother interact with other men, Tatsuya begins to view her as a woman. One night, Mina decides to take sleeping pills and go to bed early. Worried about her, Tatsuya sneaks into his mother's bedroom, telling himself it's just to check on her sleeping form. Seeing his mother lying defenseless in bed, his heart begins to waver—.