The Undead King's Reign of Peace, Vol. 1

A bland read. It's basically a heavy-handed, preachy “killing is wrong. If you kill him, you'll be just like him!” story. The character are one-dimensional, and the titular Undead King doesn't really have a character arc besides “I just, like, want everyone to live in peace, maaaan.” The conclusion is not satisfying, and the bad guy basically gets away with everything but is now a bit more inconvenienced.

Despite the Goodreads title saying “Vol 1”, this is a one-volume read (it came out in 2020, so it's either that or the next volume hasn't come out for whatever reason, but I doubt the story will continue with how it ended).