OPM I really can't stand - dropped it just after a few episodes. :)
Hai to Gensou no Grimgar had a lot of promise with a different take on the common theme, but pity it looks like it will not be continued. :(
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Hai to Gensou no Grimgar has both manga, and light novels, that stretch on for many more chapters past the anime. The Manga was good and continues on well from the anime. After reaching the end of that I picked up the light novels to continue on further.
Unfortunately (around novel 13 I think?) the author clearly didn't know what to do with the story and it turned silly and boring, so I moved on to other stuff. :(
Since you're not into Manga, this url probably won't be of interest then: ;)
https://mangakatana.com/manga/kaiju-no-8.24869/c1
• If you visit it, make sure you have an ad blocker. Too many ads otherwise.
• Japanese manga is read from right to left, the opposite of western comics. Just saying. :)