Takumi is in Last Defense Academy, a colossal school in the middle of nowhere surrounded by a wall of otherworldly flames. He and 14 other students have been drafted into the Special Defense Unit, a team tasked with keeping the school safe for the next 100 days. Initiated students transform their blood into the mysterious Hemoanima, a unique type of mutated blood which provides supernatural abilities. How much are they willing to sacrifice to take back their normal lives and save the world from the grotesque school invaders? The curtain rises on 100 days of war and despair…