Chinami, who works as a nurse, was persuaded by her husband Masahiro, who was in the hospital, to marry him. However, Masahiro is sloppy with women, and after a while of being together, he gets sick of cheating and starts playing with women again and again. Masahiro has a stepchild named Tatsuya from his ex-wife, and the three of them live together. While high school student Tatsuya hates his father who keeps cheating on him, he worries about kind-hearted Chinami. One day, Tatsuya sees Chinami looking lonely as she patiently waits for Masahiro, who doesn't come home until late at night.