"Principal" which consists of 7 volumes and had sold more than 1.2 million copies to date, features Kuroshima as Sumitomo Shima, a senior high school student whose parents are divorced and having issues with her stepfather and at the all-girls senior high school which she has just entered. As such, she decides to go to her father and move to Sapporo, Hokkaido instead. However, what awaits her at her new school are two entirely different guys Tatebayashi Gen (Kotaki) and Sakurai Wao who are so popular at school that they are regarded as the "common property" of all the girls in the school. Although Shima has little interest in romance due to her problems with her parents and school, she finds herself getting closer to the two guys gradually. Takasugi will play the role of Sakurai in the movie.
Takasugi described his character as someone who is gentle and likeable on the surface but is actually very proud and tenacious within. As the character is described in the manga as someone who is so good-looking that he's sometimes mistaken as a girl, Takasugi will try his best to play the character even though he is aware that the fans of the original manga may have various views regarding him being selected for this role. With regard to this, Ikuemi praised Takasugi for being a perfect fit for the role and hopes to see him breathe new life into the role rather than sticking entirely to the manga.