A mysterious Oni Armor, that gives the wearer the power of an Oni, has been stolen from a shrine. The thief uses it to attack Oni and Makamou alike; leaving the Oni wander what is the thief�s motives for using the armor. Meanwhile, Akira struggles with her hatred for the Makamou and what it means for her Oni training�

Having taken Todoroki�s transformation brace, Shuki sets out to get her vengeance on the Notsugo, despite the danger it poses to her former Oni comrades. As a result, Ibuki is tasked with the heavy burden of eliminating a fellow Oni, while Zanki struggles with who his former master has become�