Masamichi Isami, a middle school student, acts as a steadfast confidant and constant companion to Kento Hinode, regularly appearing alongside him during interactions with Miyo Sasaki as she seeks Kento’s attention. His easygoing presence reinforces the camaraderie within their social circle, balancing group dynamics with lightheartedness. A tentative connection blossoms between Masamichi and Yoriko Fukase, Miyo’s best friend, marked by shy exchanges and lingering glances in the film’s finale, suggesting mutual attraction though their romantic status remains undefined. Functioning as a supportive figure, Masamichi’s narrative purpose centers on bolstering Kento’s experiences rather than pursuing his own goals. His interactions emphasize the protagonists’ school-life atmosphere, anchoring scenes of classroom banter and group activities. While his bond with Yoriko hints at potential growth, their relationship—like his personal history, interests, or inner struggles—receives minimal elaboration. Existing as an extension of the core cast’s relationships, his character enriches the protagonists’ world without stepping beyond its periphery, his background and aspirations remaining unexplored in established canon.