Takagi loves playing good-natured pranks on her classmate Nishikata. But try as he might, he can never prank her back — she's just too clever!

Devils that lurk within humans, and family that is deemed irreplaceable to humans. With these two words, a new story in which familiar characters clash with passion. After a long battle, the Igarashi Family and their friends have finally achieved peace. However... a new threat that transcends Giff, the progenitor of the demons, has appeared.