If you're Kento's fan, or even if you just like japanese movies, you'll know that his speciality is high schoolers. He plays a high school boy (again) this time though not in a romantic shoujo comedy. Rather, it's about four students who are trying to solve a mystery of the past. The mystery itself isn't that interesting, though the story is kind of entertaining, with the flashbacks and the small other cases that are solved. Other than that, the movie hasn't anything else to offer. Basicly, there is no romance, no friendship dynamics, no slice of life high school nostalgia, no deep character development. So, why watch it? For the small mysteries the students are solving, and maybe if you're a Kento fan.