The Devil is a Part-Timer Novel Volume 18 is written by Satoshi Wagahara and illustrated by 029 (Oniku).

New management has taken over at the Hatagaya Station MgRonald location even as the veteran staffers leave one after another and Chiho isn't planning on showing up anymore either due to college exams closing in. Still, trying to adjust to the new store order might be the least of Maou's worries since he's also managed to rack up a huge debt with the landlady!!