Kakeru Sengoku, a third-year student council president at Katagiri Senior High, possesses a slim frame, pale skin, and striking crimson hair swept to the right, matching his vivid eyes. His delicate features and high-pitched voice often draw feminine perceptions, compounded by his habit of layering clothes to conceal his slender physique—a self-conscious practice that fuels his aversion to public undressing, particularly during swimming events.

Academically unrivaled, he claims top academic honors schoolwide and surprisingly secures second place in physical education despite his clumsy athleticism, all while nursing a dread of insects and horror genres. Though inherently shy, Sengoku adopts a stern, rule-enforcing persona as president, his irritation frequently surfacing during duties despite a distaste for conflict. Among Kyouko Hori’s circle, his demeanor sharpens into playful abrasiveness, especially toward rival Tooru Ishikawa, yet mellows tenderly around girlfriend Remi Ayasaki, friend Sakura Kouno, and animals.

His complex history with Hori traces back to middle school, where he endured her bullying—a dynamic reversed in high school as he asserts leadership, winning her wary respect. Romance blooms with Remi after she discovers his bookish side, cementing their steady relationship. Despite his reserved nature, he occasionally indulges in comedic rivalry with male peers vying for classmates Akane Yanagi and Honoka Sawada’s attention.

Sengoku’s growth includes tentative strides toward embracing his physique, though it remains a lighthearted recurring theme. As council president, he upholds order with disciplined rigor, yet subtly supports peers through empathetic guidance, balancing authority with quiet compassion.