Monster Fusion:The Path of Infinite Cultivation - Chapter 14: Mice+rooster=Miceooster

Humanity had finally ended the war with the Demon Race and sealed them away, forever.However, they now have to face the treat of the Shadow World, an equally dangerous threat to their civilisation under the rule of the Emperor!Facing only misfortune from a young age, Nikolaus Reinhardt never expected anything good to happen to him.But his world completely changed when he awakened as an Ascendant, and accidentally summoned a member of the Demon Race in his house.Just because he messed around with a god damn book!

“First, a hidden marriage.”“Second, the marriage period is one year.”“Third, you are not allowed to have any feelings for me!”These were his three stipulations to her at the entrance of the Civil Affairs Bureau.She readily agreed and adhered to them one by one.But a year later, is the man holding onto her tightly and refusing to let go still the same cold person from a year ago?“Could you let go, please? Our one-year term is up.”“Wife, the contract you signed is indefinite!”

A boy from 21st century Earth, met an accident and later was reborn in Naruto’s Ninja World.
He is born in Uchiha Family and becomes the useless brother of Itachi Uchiha and Sasuke Uchiha…. Let’s see how he changed the Naruto world.

- Description from Novelupdates