Rinko hears a request from a fat guy who summoned a red, lizard-like demon. Apparently his "beloved" is trapped inside a giant tower and he needs the help of Akutabe and his cohorts to save her. Rinko is skeptical at first, but the demon uses his "Revolution" power to make her eat her untrue words and make them become the truth. Not only does she believe the fat guy, but suddenly finds Azazel attractive against her will. However, the other demons decide to join the lizard, thinking that he can make their lives better.
Akutabe later returns after taking money to protect the model Ebi from a malicious stalker, the same one who is looking to hire Rinko, Azazel and Beelzebub to capture her. After Akutabe arrives, the others escape but not before he manages to find the grimoire that summoned the lizard. Using the same book, he summons a demonic mermaid and makes a contract with her, as she is part of his plan to defeat the lizard and the stalker.
It turns out the mermaid has a shapeshifting power: Not only can she change her own appearance, but her jealousy can lead her to change the appearance of others as well.