HUNDRED LINE: Saishuu Bouei Gakuen

Takumi Sumino is an entirely unremarkable teenager residing in the Tokyo Residential Complex, a seemingly perfect district where monotony reigns and misfortune never strikes. That illusion of safety shatters when grotesque monsters descend upon the town, unleashing absolute chaos. Amid the destruction, a mysterious entity known as Sirei appears before Takumi, offering him the strength needed to protect his loved ones—but only if he plunges a blade directly into his own chest. Upon accepting this harrowing bargain, Takumi awakens at Last Defense Academy, an isolated institution encircled by towering walls of supernatural fire. He joins fourteen other students who have been conscripted into the Special Defense Unit, a desperate squad assigned to defend the academy for exactly one hundred days. As monstrous invaders relentlessly besiege their stronghold, these teenagers must confront the ultimate question: what are they truly willing to sacrifice to reclaim their ordinary lives and save the world? Thus begins a grueling saga defined by warfare and despair.