The Billionaire's Kept Woman - Chapter 17 - Their Past

Nagasawa crossed to Naruto Universe and was bound to Konohagakure.

If Konoha is severely damaged and destroyed, Nagasawa’s lifespan will be reduced.

He panicked at the thought of the upcoming Nine-Tailed Demon Fox’s attack , and the thought of Konoha getting destroyed left him in despair.

Fortunately, while bound to Konoha, he can obtain templates of powerful characters.

At the beginning, He got the Whitebeard template! Since it’s the Whitebeard from the Summit War of Marineford, he can use Tremor-Tremor Fruit’s ability and Haki.

Facing the Tailed Beast Ball, which terrorized Konoha Shinobi, Nagasawa leaped and shattered the Tailed Beast Ball with one punch!

- Description from Novelupdates

All things are born from the void and all things shall return to the void.

Elias, a large and beautiful world consisting of millions of planes and millions of different races.

And such a wonderful world is run by powerful beings called Gods! Born from the dawn of time their divine might shines on all beings.

Over time It is said that the Gods created everything. But is that really true?

If so, who created the Gods?

Accidentally reincarnated in this strange world due to an unforeseen accident. With a thirst for knowledge and a hunger for power, Elric with the help of his A.I chip seeks a way out for himself whilst under the oppression of the Gods.

Soon under Elric's relentless desire for knowledge, the first group of humans with powers comparable to Gods were born, Wizards!

He dissected a flame slime and learnt to control flames.

He studied a dragon and created dragon-slaying magic.

He tasted a Phoenix and cracked the secret to immortality.

Unexpectedly before he knew it most of the races in Elias had been studied and dissected by him already.

One day when he was bored and there was nothing to do, Elric suddenly turned to the sky with a sly smile on his face.

“I know! Why don't I study the Gods!”

That day the whole Elias shook. with a crazy smile on his face Elric led an army of wizards and stormed the God realm!