Though Kawahira keita is the descendent of a long line of Inukami-tamers, he seems to lack the necessary ability. One day, he meets a cute Inukami named Yoko, who, at first glance, looks obedient, and beautiful.... but upon forging a contract with her, Keita discovers that Yoko is a mischievous Inukami that no one has ever been able to control.