Along Came a Leviathan (S01E06)

Azusa gets a special invitation from Beelzebub to join a ceremony in the demon realm, having gained admiration from the demons for resolving the feud between the two Dragon clans in Laika's homeland. Excited about the honor, she decides to bring her entire family along. However, there's a hitch: Rosalie, the ghost, can't wear a dress. Determined to include her in the festivities, Azusa taps into her maxed-out powers to craft a magical spell that will help Rosalie join in the celebration like everyone else.