A Japanese sword is brought to Mizuha Hiiragi, a high school girl who is a daughter of a shrine keeper, by her friend Sachiko. She is a mysterious Japanese sword that cannot be pulled out of its scabbard, and she wants to ask Mizuha to exorcise her. In fact, the sword is inhabited by the soul of a woman named Ichino: Mizuha tries helping her but things get tangled and she ends up living with Ichino all the time. Ichino declares that if she finds four kageuchis somewhere in this world and purifies the souls of her daughters who sacrificed her, she will be able to leave Mizuha... A magical sword fantasy battle drawn by Kaoru Shintani!