After Noir, a baronet's son, loses his job, his younger sister, Alice, suggests he attend Hero Academy. His friend Emma believes he will succeed since Noir possesses the rare magic skill Great Sage, which reveals the correct answer to any question but causes crippling headaches. Emma reveals a former Great Sage alleviated his headaches by kissing his wives and embarrassingly requests Noir kiss her. Noir finds his headache gone and learns from Great Sage great strength lies in a hidden dungeon. There, Noir finds the famous heroine Olivia bound by Death Chains...