Akuto Sai enrolls in Constant Magic Academy with the noble ambition of positively impacting the world. Alongside his friendship with Junko Hattori, a righteous ninja, they pledge to create a brighter future. However, his aspirations take a dark turn when a prophecy labels him as the feared Demon King. As this ominous revelation spreads, suspicion and doubt cloud the school, straining his bond with Junko. Despite his unwavering resolve to defy this preordained path, every action he takes seems to reinforce his menacing fate. Complicating matters, Akuto finds himself at the center of attention from a group of enchanting girls, each with their own agendas, from seeking justice to offering affection. Armed with newfound abilities, Akuto must navigate a web of challenges and adversaries to prove that he can shape his own destiny.