Demon brothers Lucifer, Mammon, Leviathan, Satan, Asmodeus, Beelzebub and Belphegor seldom see eye to eye. Each one embodies one of the seven deadly sins, and that sin shapes what he cares about most. So when the family plans a trip within the Devildom, settling on where to go and what to do becomes a real challenge. The brothers have to work out which destinations and activities could make the getaway worth it for all of them. This single comedy fantasy special for Obey Me! arrived in 2021 as a lead-up to the announcement of the ONA series.