Chinami, who works as a nurse, was approached by her husband Masahiro, who was hospitalized, and married him. However, Masahiro is careless with women, and after a while of being together, the insects of infidelity started to seduce her and she started to play around with other women. Masahiro has a child from a previous marriage, Tatsuya, and the three of them live together. While Tatsuya, a high school student, hates his father for being constantly unfaithful, he is worried about the Kokoro-hearted Chinami. One day, when Masahiro doesn't come home until late at night, Tatsuya notices Chinami looking lonely as she waits for him...