Hai to Gensou no Grimgar

[KrayZ33]

To be fair, they ended Grimgar at a very solid point considering that they most likely only wanted to test the water.
Of course, there is so much more to be explored and to do in that World and the question why they are even there remains, but overall it was probably the best moment for them to stop after 12 episodes.

It might even be the reason why this show is considered "slower" than most. They didn't want to start new threads and mysteries, instead they focused on finishing scores that had to be settled and could define the characters more accurately in the process. Compare that to what Log Horizon did... open and unfinished plot lines everywhere, even after 2 seasons. More and more were added.

I can honestly say that Grimgar had a nice ending that doesn't leave you hanging somewhere in the middle of something.