Hayato's classmate, Nima, is a descendant of a bloodline with powerful magical power, hence chosen to be to the next 'War Miko' when the monsters again creeping into the world of humans. Soon, monsters come for Nima, Hayato intervene then witness Nima's powerlessness and Nima's mentor, Genkai's harsh treatment to Nima. After being revealed that Hayato himself has rather strong magical power by Genkai's subordinate Taki, Hayato decided to follow Nima to her training in the world of monsters to support her. Akane and Saga later join.