Nitta Masaki is about to start work as a music teacher at a high school. The high school has experienced turbulence due to the missing person case of the prior music teacher. On the night before Nitta Masaki's first day of work, he visits the music classroom and plays the piano. There, he meets student Izumi Sae. She is his student in homeroom class. Through the missing person case, Nitta Masaki and Izumi Sae soon get closer to each other. Nitta Masaki doesn’t want to admit that his feelings for her has turned into love. Meanwhile, Izumi Sae has no doubt that her feelings for him is love. They then part ways. 5 years later, Nitta Masaki & Izumi Sae meet again. There doesn't seem to be any obstacles in front of them to prevent their love, except for one thing. That is Nitta Masaki is a married man, who has a wife.
24-year-old Murakami Maiko is a very sheltered girl who has never had a relationship with a guy. It is decided that she will go for a matchmaking session with someone recommended by her father Genichiro who owns a company. The man Hanasato Harumi is 20 years her senior and also a divorcee. Although Maiko is less than thrilled, she discovers when they meet that he is a charming man with an air of maturity and she instinctively makes a move on him. Harumi had intended to meet Maiko once before he turned her down since she is the daughter of the CEO of an important client. However, she turns out to be more than he had imagined. Maiko confounds him the whole time but he is attracted to her straightforward, pure, and dignified nature. He accepts the completed marriage registration form from her on their third date after she presses him for a kiss. They get married despite their 20-year age gap, and their life as newlyweds begins.
