Seiichiro Takamine, second-in-command of the Yamainu Squad, enforces order in a historical military unit with strategic authority. At 36, his imposing 183 cm frame and 80 kg build complement his combat mastery, honed through years of service. Born August 22 (blood type B), he wields a massive, meat-cleaver-like sword with precision, embodying both physical dominance and tactical discipline. A brusque, quick-tempered warrior, his stern exterior masks a complex duality—seasoned by battlefield rigor yet softened by a penchant for drink. His responsibilities include mentoring Rakuchou Takeda, a fiery 19-year-old recruit whose clashes with others lead to disciplinary turmoil. Seiichiro’s leadership cements his role as a pillar of the Yamainu, balancing mentorship, command, and unyielding battlefield prowess.