 If you liked
Overlord
|
 ...then you might like
Ore wa Seikan Kokka no Akutoku Ryoushu!
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Both of this novels are similar in the comedic aspects. A powerful main character that through luck and misunderstandings gain the praises of their subordinates.
The main difference is that "Overlord" have a more serious tone, meanwhile "I’m the Evil Lord of an Intergalactic Empire!" is just comedy.