Interdimensional employee in anime

This is my first time writing so please go easy on me. Grammar mistakes can happen please read at your own risk.

The MC will mostly be in naruto, I will make a new novel if he goes to different anime and settings.

Karan dies, gets a job offer from hell(Organization name) and transgressed to Naruto world.

Hell gets requests from people of various anime and unknown worlds and Hell asks its employees to fulfill them.

At the Marinford Luffy or Whitebeard (I will let readers decide) requested to save ace, which results in a crack in space from which comes out a skinny, demon-like creature dark smoke was coming out of it. It war Karan

Madara after getting betrayed by Black Zetsu asked to fulfill his life's goal of casting infinite tsukuyomi to the world and a battle against team 7 vs Karan, who looked like Madara uchiha before the ten-tails.

and more but you need to read it to find out.

The cover isn't mine, I took it from Google, Give credit to its creator

I don't own any anime settings that appear here, nor do I own any characters other then the characters I created.
though the story is mine creation.