Masahiro Setagawa, a hapless teenager constantly at the beck and call of local bullies, resigns himself to a life without saviors. Everything changes when he crosses paths with Kousuke Ooshiba, the formidable 'Bear Killer' renowned for thwarting gang activity. A year later, Masahiro and his estranged friend, Kensuke Ooshiba, find themselves in the same high school, shocked to discover Kousuke as their math teacher. As their bonds deepen, Masahiro sees Kousuke as a beacon of hope while Kousuke feels an overwhelming urge to safeguard him. Yet, their ordinary routine takes a dramatic turn with the return of Kensuke's old pal, Asaya Hasekura, whose feelings for Kensuke go beyond friendship, throwing them all into confusion. Can these three navigate the complexities of high school life, or will forbidden affections drive them apart indefinitely?