After bidding farewell to the troubled junior high school years, Usa Kazunari (voiced by Iguchi Yuichi) who entered high school was determined to spend three years of peace and tranquility, and shared a rare youth with a pure and gentle girl. In the school library, Usa accidentally met his senior Kawai Ritsu (voiced by Hanazawa Kana) who was concentrating on studying, and couldn't help but feel emotional. At this time, Usa's parents transferred jobs. In order to be able to live freely, he planned to enter Kawai Village, which was managed by Kawai Sumiko (voiced by Kobayashi Sanae). As a result, he encountered the perverted classmate Shirosaki (voiced by Shinomiya Go), who was very unpopular with men, Nishikino Mayumi (voiced by Sato Rina), and the naughty and black-bellied girl Watanabe Ayaka (voiced by Kanemoto Hisako). He originally planned to escape from the world of monsters, but when he learned that Ritsu also lived here, he couldn't help but stay. In the youth full of unknowns, the story of laughter and tears coexisting is staged... This film is adapted from the manga by Miyahara Ruri.