Shoichi works at his father's workplace in order to take over the company in the future. Shoichi feels strong Kokoro towards his father, who is careless with women and always takes a different woman with him. One day, Shoichi finds his father's diary with plans with a woman written in it, and when he visits the house of his father's mistress, he is greeted by Akari, who works at the same workplace... Shoichi is hesitant to persuade Akari, who has a completely different atmosphere from the workplace, to break up with his father, but he ends up learning from Akari about the complicated relationship between men and women...