Brothers Lucifer, Mammon, Leviathan, Satan, Asmodeus, Beelzebub, and Belphegor are among the most powerful demons in the Devildom, sitting on the Royal Academy of Diavolo's student council (RAD). However, being avatars of the seven deadly sins, their actions frequently veer toward the extreme. Their regular shenanigans belie their lofty position and terrifying reputation among their peers. Behind the scenes, the members of this family are more lovable—and hilarious—than they appear!