Beelzebub shows up at Azusa’s place to announce that the Demon Realm has awarded her a special Medal of Honor in recognition of ending the conflict between the Red and Blue dragon tribes. It will be awarded in the Demon Realm, which means Azusa and her suddenly quite large family will have to take a trip. They’ll also need some nice dresses to wear.
The problem is, because Rosalie isn’t corporeal and her clothes are simply an afterimage from her life, she’s unable to change into a dress. Shalsha consults a friend who researches ghosts, and Azusa eventually uses her Create Magic to invent a spell that will enable Rosalie to wear whatever she wants. With that issue sorted, Beelz arrives with their ride to the realm: a massive leviathan.
That leviathan happens to be carrying a five-star hotel and spa on her back, making her far more hospitable than the White Whale from Re:Zero. She also has a sister in Vania who serves as chief steward in human form. The two switch off their roles, and when Azusa & Co. meet her, she’s in the baths while on the clock, irking Beelz.
But what Vania lacks in modesty, she makes up for with tremendous culinary skills, preparing a lavish multi-course meal with the highest class ingredients. After dinner, Azusa’s brood luxuriates in the baths, with the warning that if they stay in the water for too long they may melt.
That night, Rosalie, who never sleeps, is joined on the balcony by Halkara, who can’t sleep. When Rosalie thanks her and says she’s in her debt for freeing her from the factory, Halkara tells her there’s no debt to forgive; as her master Azusa would say, they’re family now. It’s why the next morning everyone is so concerned that Halkara melted when she went off for a midnight dip. Turns out she was simply sleeping under the bed rather than on it.
The Leviathan finally arrives in the Royal Capital of Vanzeld, and the group is dropped off at the Demon King’s central castle. Azusa is understandably weary about meeting someone with such a sinister title, but Beelz assures her that the Demon King is kind of heart, and will not be offended by minor breaches in etiquette.
Upon entering the Demon King’s throne room, both Azusa and Halkara mistake the diminutive child for someone other than the Demon King she actually is: Provat Pecora Allieres. Halkara is mortified upon learning this, but when Provat tells her not to bow to her and promises never to harm any of them, Halkara shoots up a bit too fast, smacking Provat in the head and knocking her out.
With that, the King’s guard swarm and surround Halkara and the others, and when Azusa appeals to Beelzebub, Beelzebub admits that Halkara will, in all likelihood, be executed for assaulting the Demon King. Hopefully Provat will wake up and this can all be cleared up—and even if it isn’t, Azusa is probably powerful enough to spring everyone. But until further notice, Halkara is placed behind bars.