I never heard of an villain in any isekai manga go through training, FOR 50 YEARS mind you!
The story was actually good, tho surprisingly, his name still wasn't revealed yet (other than that time during Docolla's death which was purposely erased).
Yeah his name and past life (other than being a neet) had been hidden and he likes to brake the 4th wall here and there. Maybe he is a self insert for readers or it will be revealed later on… （￣へ￣）
YOOOOOO! That ending was a BOMB. NGL, this story is good despite that ending. Hope we get a continuation.
It's been so long since i've seen this level of art, hope the author continues to maintain it.