A mysterious Armor of the Ogre, 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. Akira starts wondering if the hatred she has for Makamou is really a bad thing and if she should throw away her school life and dedicate her time to becoming a full-fledged Oni.