The Devil Is a Part-Timer!, Vol. 12 (light novel) — Satoshi Wagahara

Thanks to the unflappable efforts of Maou and friends, Emi has made it back from the world of Ente Isla in one piece, though at the cost of her job at the call center thanks to all those pesky, unexcused absences. Adding insult to injury, Maou confronts Emi with a bill for "expenses incurred" during her rescue: 350,000 yen!

Emi is shocked, but her pride as the Hero means she can't bear to be indebted to a demon. Soon she's dipping into her saving to and searching for a new job to pay off the balance owed. At the same time, Urushihara, sequestered in a hospital by Maou's landlady, Miki-T, is experiencing frightening bodily changes... And all this while Maou refuses to go to work?!