Akuto Sai's aspirations of a positive change in the world led him to enroll at Constant Magic Academy. He quickly befriends virtuous ninja, Junko Hattori, and together they pledge to work towards their shared vision. However, upon his arrival, a prophecy declares Akuto as the Demon King, causing widespread fear and suspicion towards him. Even Junko begins to doubt him, as Akuto struggles to prevent fate from dictating his future. Additionally, he finds himself surrounded by a group of beautiful girls, each with their own agenda. Some want justice, while others seek his affection. As Akuto's powers awaken, he must face increasing obstacles and fight to prove his fate is not predetermined.