In a world shattered by the fatal 'Labyrinth Disease' that targets only girls, students engage in lessons focused on saving the world by killing the afflicted girl. With six hours to succeed, they study magic, navigate the labyrinth, form alliances, and uncover the girl's weaknesses. Amidst this dire mission, a reluctant protagonist, uninterested in the world's fate, embarks on a journey filled with magic and youthful vigor. Join this unique school fantasy of labyrinth raiding, where the fate of the world hangs in the balance!