[FORGOT] Fantasy with a few naruto elements
#1
The story was about someone who crossed over into a fantasy world, but was sent to the early times of the world. He had a slime girl maid later on I think and met two siblings who were Uchiha with Sharingan eyes. He transplanted them into himself and gave them his eyes after the siblings offered to give him one eye each.
RE: [FORGOT] Fantasy with a few naruto elements
#2
It's called the "making of a god slayer" I'm pretty sure it's dropped though.