Movie
Description
Shirō Mizunuma is the student council president at Konan Academy in the early 1960s, leading efforts to preserve the student clubhouse, the Quartier Latin. He has brown hair and wears rectangular glasses. His standard attire is a blue school uniform, cap, jeans, and black shoes; casually, he wears a blue turtleneck sweater and brown jeans.

Intellect and strategic thinking define him. He publishes his physics exam in the school newspaper after disputing an unfairly low grade. His cunning is evident in tactical decisions, like directing students to sing the school anthem to mask a heated debate about the clubhouse from the principal, maintaining their position during inspections.

His relationship with Sora Matsuzaki, Umi's younger sister, develops through student assemblies and social gatherings. Sora initially admires Shun but shifts her interest to Shirō, inviting him to farewell parties and spending time with him regularly.

In the Quartier Latin campaign, he coordinates demonstrations, deploying protest banners and organizing Shun's jump into the school pond to attract attention. He travels to Tokyo with Umi and Shun to lobby school board chairman Tokumaru, successfully persuading him to visit the renovated clubhouse. His leadership includes delegating tasks, recruiting Umi for the school newspaper due to staff shortages, and overseeing the clubhouse restoration.

He demonstrates perceptiveness in personal dynamics, noticing Shun's avoidance of Umi and inquiring discreetly about their strained relationship. His supportive nature shows when expressing gratitude to students assisting with the clubhouse cleanup and ensuring Umi remains involved in critical meetings.

His background includes an older sister working in astrophysics, mentioned at Coquelicot Manor. The etymology of his name reflects meanings related to history and water elements. His role evolves from competent administrator to active participant in preserving institutional memory, emphasizing collaboration between students to achieve common goals.