At Brimor Academy, Atsuo is a perfectly normal student who was lucky to have been admitted. Along with his friends at the Fortunatus faction he lives his daily life, until misfortune inevitably finds its way to him. Suffering from the all-black phenomenon, he is not prepared for the turn his life is going to take after deciding to attend a seemingly harmless intra-faction event. Before he realizes he’s forced to repeat the same day over and over again.