Is The Devil is a Part-Timer Based on a Manga or Light Novel, and is it Finished?

The Devil is a Part-Timer began as a series of light novels. From there came a shonen manga, written once again by Satoshi Wagahara. The manga is ongoing but the light novel series is complete.

The Devil Is a Part-Timer! - Wikipedia

The Devil is a Part-Timer Season 2 Release Date Revealed in Trailer

It's awesome when animes do this, end the series with some event or quote from the beginning like OHSHC

The Devil is a Part-Timer Season 3 Episode 3 Release Date & Time

The Devil is a Part-Timer! Volume 19 Light Novel Review - TheOASG

Best Light Novels That Ended In 2022

Hataraku Maou-sama!! (The Devil is a Part-Timer! Season 2)

The Devil Is a Part-Timer!! Novel Series Gets New Volume on September 8 - News - Anime News Network

The Devil is a Part-Timer! – English Light Novels

The Devil is a Part-Timer!! Gets the Gang Together for Updated Visual

Review – The Devil is a Part-Timer! Complete Series