Sato is an employee conducting a survey in front of Sendai Station. Saki takes the survey and the two ultimately become a couple. 10 years later, Sato proposes to Saki on the occasion of their 10th anniversary.
Shun Fujishiro is a psychiatrist and works at a university hospital in Tokyo. He is engaged to Yayoi Sakamoto. One day in April, when he is about to marry Yayoi Sakamoto, he receives a letter from his first love Haru Iyoda. They dated 10 years ago. Suddenly, his fiancé Yayoi Sakamoto disappears.
Satoshi Makino is a genius classical guitarist. One day, he meets journalist Yoko Komine. They become attracted to each other, but Yoko Komine has a fiancé.
