is a Japanese science fiction drama film directed by Takeshi Furusawa, starring Taishi Nakagawa and based on the manga series of the same name by Yayoiso. It was released in Japan by Shochiku on 15 April 2017. The theme song for the film is "Sakura" by Sonoko Inoue, the cover of Ketsumeishi's 2005 single.
Arata Kaizaki (Taishi Nakagawa) is 27-years-old and unemployed. He quit his prior job after working for the company for 3 months. Arata decides to take part in a research program. He takes medication that makes him look younger and he is to attend high school for a year. There, he falls in love with female high school student Chizuru Hishiro (Yà «na Taira)