I need to verify if this is a real title. Sometimes users might combine a known work with a random string, which could be a mistake. Let me check. The title seems similar to a 2019 Japanese film "Shounen ga Otona ni Natta Natsu" directed by Shūsuke Kaneko, starring Gō Sakaguchi. That film is a coming-of-age story about a boy facing his father's death. So maybe the user is referring to that.