High school girl Utako Honjo (Tsuchiya Tao) is innocent and naive. Once she lied about her age and attended a social event with her friend Yaguchi Sanmon (Tina Tamashiro) and other sisters. At the banquet, the cold-faced handsome man Sagano Kota (Kamenashi Kazuya) helped her out. Afterwards, under the influence of alcohol, Kota expressed his desire to further his relationship with the girl next to him. But when Utako told her her real age, Kota turned cold and walked away. The next day, Utako and her friends were questioned by a policeman. To Utako's surprise, the other party was Kota Sagano. Kota is 23 years old and is the chief inspector of the regional department of the Otoo Police Station. He deliberately kept a distance from the underage Utako and warned the girls to be careful of the perverts around. Not long after, Utako was entangled by the pervert. In the moment of crisis, Kota helped. It seems that through this incident, Utako began to change her view of Kota's ruthlessness and indifference, and she fell hopelessly in love. This film is adapted from the manga of the same name by Maki Mitsuki.