Keito Hasumi, raised as a Buddhist priest’s son, carries a disciplined worldview forged through temple life and a staunch adherence to duty. His childhood intertwined with Eichi Tenshouin and Rei Sakuma, fostering relationships defined by layered alliances and simmering rivalries. As Yumenosaki Academy’s student council vice-president, he enforced order with meticulous rigor, often lecturing peers while covertly stabilizing Eichi’s leadership. Tall and lean, he sports moss-green hair, sharp yellow-green eyes, and heptagonal glasses. His AKATSUKI stage attire merges tradition with dynamism—a red-and-white single-sleeved kimono paired with a black obi, complemented by performance-ready accessories like a folded purple fan or athletic tape. Beneath his austere exterior lies a conflict between duty and vulnerability. Though authoritative and dryly witty, chastising unitmates like Kuro Kiryu as “muscle daruma,” his sternness masks protective instincts. Secretly, he channels stifled creativity through manga artistry under the pseudonym Mizuhanome, a rebellion against his rigid persona. Leading AKATSUKI, Keito initially upheld traditional performance arts but later championed modernization, as seen in their evolution during *The Legend of KAGETSU* event. By recruiting Taki Ibuki, he balanced innovation with heritage, prioritizing communal effort and fan gratitude. His leadership mantra—carving “new paths”—reflects a pragmatic shift from inflexible traditionalism. Relationships reveal contradictions: a turbulent yet loyal history with Rei spans their DEADMANS collaboration and subsequent clashes over dependency. With Eichi, he shares guilt over their morally gray academy reforms, striving to amend past ruthlessness. Souma Kanzaki idolizes him as a mentor who instilled purpose within AKATSUKI. Quirks include a phobia of large animals stemming from childhood temple incidents, contrasting his fondness for small creatures. Skilled in ventriloquism, he signs autographs with painstakingly precise kanji, honoring craftsmanship. Post-graduation arcs depict Keito embracing collaboration while guiding AKATSUKI’s fusion of tradition and modernity. Events like the covert *Daikagura* New Year performance underscore his growth from rigid enforcer to adaptable leader, strategically navigating secrecy and spectacle to honor both legacy and progress.