Azusa and the others get the wrong idea that Halkara is preparing to move out, so they arrange a surprise party, only to learn she was only looking for a new location for her energy drink factory. The fact remains, she’s working long nights and Azusa is concerned. Turns out the reason is that there’s a ghost at the new factory that has scared away all of Halkara’s local employees.
In order for Halkara to start coming home at a reasonable time, the “bound spirit” must be dealt with. Azusa summons Beelzebub for this purpose, though because her incantation is a little off, Beelz ends up in the bathtub full of cold water (for the crops…it’s eco-friendly!) As Azusa and Halkara cower and tremble behind her, Beelz quickly finds the ghost and makes her visible.
Her name is Rosalie (voiced by Sugiyama Riho, Minare from Wave, Listen to Me!), and she’s the ghost of a girl who took her own life centuries ago after her parents were preparing to sell her off for “chump change”. In the ensuing years, she “went bad”, which explains her rudeness (and makes Sugiyama a great choice).
Rosalie has wanted to leave the factory for a while, but without success. After her offer to erase her without a trace is shot down, Beelzebub suggests that if she possess one of them, she’ll be able to relocate. Halkara seem the most suitable vessel as she has the most “weak points.” The possession is successful, and Rosalie!Halkara strikes a samurai pose as she accepts Azusa’s kind offer to live in her house.
A problem arises when Rosalie arrives at Azusa’s to find she isn’t able to separate from Halkara’s body; apparently they were ridiculously compatible! After a number of attempts to shake, shock, and spook Rosalie out of Halkara’s body, Azusa gets the idea to make her drunk (easily done with Halkara’s tolerance). When Rosalie passes out, Halkara’s personality surfaces.
That just leaves the matter of how to exorcise the dormant ghost from her body. Beelzebub has a solution: toss her into that eco-friendly cold bath water. Rosalie pops right out from the shock, and is now successfully separated from the location of her death.
With that, Azusa arranges for Rosalie to meet the townsfolk to prove she’s a friendly ghost, and she’s happy to use her ghostly telekinesis to do chores for people to build goodwill. Rosalie announces she’s Halkara’s newest employee at the factory, and nobody needs to fear her. And that’s how Azusa’s family grows by one once more.