Seikichi Kuroda, the self-proclaimed guardian of Hekikuu High School, faces a challenge when a new transfer student, Seiichirou Kitano, arrives and frightens the class with his terrifying demeanor. Despite Seikichi's attempt to assert his authority, he is taken aback by Seiichirou's unsettling appearance, which drives him away in fear. Surprisingly, behind this intimidating facade lies a kind-hearted soul. Seiichirou, plagued by his appearance and poor communication skills, struggles to connect with his peers, leading to a life of isolation. As Seiichirou takes on the role of guardian, he learns that friendship can blossom in unexpected ways and under unconventional circumstances.