The Devil is a Part-Timer Novel Volume 13 is written by Satoshi Wagahara and illustrated by 029 (Oniku).

The angel Laila and her daughter, the hero Emi are still getting along terribly even after they cooled off following their parent-child fight. Maou is completely fed up with their antics, leaving him in a tight spot when Laila starts explaining the details of her "job" to save a parallel world. Unwilling to take her at her word, Maou demands to a visit to Laila's home. She tries to shoot down the idea but the group ignores her and so starts their journey to Nerima!