At the Ten'hearses Academy, students wield 'Secondary Names' tied to ancient heroes' powers. Ryoma, lacking this gift, embarks on a labyrinth quest with his comrades and encounters Hilda, a silver-haired maiden bathing in a jungle oasis. Hilda, their savior in the underground maze, arrives on campus and surprises Ryoma with a sudden kiss. Step into a supernatural adventure of mystery and exploration set within the school's enigmatic labyrinth!