The seven demon brothers—Lucifer, Mammon, Leviathan, Satan, Asmodeus, Beelzebub, and Belphegor—are a collective of yandere characters. They are extremely controlling, jealous, and possessive, willing to kill for the object of their affection. Their individual personalities shine through their obsession: Asmodeus uses pet names like 'sweetheart', Beelzebub's gluttony takes a sinister turn as he wants to 'taste' you, and Belphegor makes suggestive, unsettling promises.