Tsubomi Sakagami, a clerical worker for 18 years with no hobbies or special skills, is suddenly sent to a company exhibition on the day before her 40th birthday. The person who helps her with her unfamiliar job is Kohei Nakajima, a 12-years-younger sales department hopeful. Tsubomi goes home late at night after working overtime and celebrates her birthday on the way home. Feeling anxious about her future, Kohei rushes into her life as she is shedding a single tear, and tells Tsubomi that he loves her….Tsubomi, who has always been a single woman and not chosen by anyone, is now in her forties, and for the first time in her life, spring has come too late… What will happen to her?