Baka_tsuki has deleted the LN from their lists.
Psylocke Scans has done Volume 3 but seems to have stopped.
If anyone else was looking for the source or even proof, it took a bit of doing but here you go.

https://www.hachettebookgroup.biz/titles/satoshi-wagahara/the-d evil-is-a-part-timer-vol-1/9780316383127/