Chiyomi Horikiri (Maika Yamamoto), a high school girl with a crush on Shunichi Minami (Taishi Nakagawa), mysteriously shrinks to 15 cm tall after a heated argument with her parents. Shunichi, her childhood first love who became distant after his father's disappearance, discovers her tiny form and takes her home. As they navigate this unusual situation, Chiyomi hopes Shunichi can help her return to her normal size. Their rekindled connection challenges them to confront their past and potentially reestablish their lost relationship. This is a 2015 Japanese romantic comedy drama based on the manga "Minami Kun No Koibito" and directed by Kazuya Konaka.