Aoshi Hana Sho (Ayase Haruka), who is plain-looking and unsociable, is an ordinary office lady of the Yokohama branch of Teie Bussan. She is 30 years old and still a virgin, and has never had any experience in love. After her best years, Hana Sho lives with her parents who care for her, and relaxes on her own. Even though she sighs at the vagueness of love, she seems to have gotten used to this quiet loneliness. Who knew that everything changed on the night of her 30th birthday? She and Tanokura Yuto, a college student who works part-time in the company and is 9 years younger than her, drank and slept together. Hana Sho, who has always been cautious and hardworking, was absent from work for the first time, and she didn't know what to do with this emotion. At the same time, Asao Yu (Tamaki Hiroshi), CEO of a company in the same office building, seemed to be interested in this rather special girl. Miss Wallflower's peach blossom period unexpectedly unfolded without any warning... This film is adapted from the manga of the same name by Fujimura Mari.