Yeah, I have it too! On the side it says book 1-3 so I think there is more.
Then again, I'm not done reading it, so I don't know.
I don't think there are more than 3 volumes for this manga because in the afterword of the complete collection the mangakas first sentence is >>Thank you so much for reading Dictatorial Grimoire right up to the end<<
So even though it is sad there surely won't be more volumes ╥﹏╥
Yeah, I finished it awhile ago and I was like..."I WANT MORE!" I wasn't done when I made my first comment but finished it a little afterwords and I finished it all in one day!
I understand your feelings! I wished thre would be more, too! ლ(´ڡ`ლ)
I've already reread it so many times and it makes me so sad again and again that there isn't more .... ╥﹏╥
The first 2 chapters got me really interested.
So I bought an english licensed version of this manga, ''The Complete Collection'' version which was almost half the price in comparison of buying the 3 volumes each for each.
And I think it was totally worth buying it because the plot got more and more interesting and even though it felt a bit rushed in the end I really loved the story with all its characters.
(little Spoiler:
And I had to totally squeal when the scene showed up in which Cinderella kisses Otogi ε=ε=(ノ≧∇≦)ノ(- even though it didn't have any romantic meaning ) It made it so worth again that I bought it!! ლ(´ڡ`ლ) )