Masamune Sakurakouji, a third-year student and student council vice-president at Aokisora High, enforces school regulations with principled dedication. He first intervenes when the Handicraft Club pressures first-years Towa Honda and Haruki Mishima into membership through deceptive tactics, issuing a yellow disciplinary fine card. Cautiously advising the newcomers to avoid unintended club commitments, he balances stern oversight with underclassman guidance.

His responsibilities include conflict mediation, such as resolving a confrontation between athletic club members and Natsu Asumi over teamwork disputes. Collaborating with council president Mikado Nakajima, he assigns volunteer tasks to those disrupting order, ensuring accountability. During events like the sports festival, he organizes activities and monitors participant conduct, reinforcing his role in upholding institutional harmony.

Official narratives omit extensive personal history, focusing solely on his disciplined student council duties. His surname, Sakurakouji, blends “cherry blossom,” “small,” and “road,” while his given name, Masamune, stems from terms denoting “proper” and “essence”—linguistic echoes of his steadfast integrity.