Shinrei Tantei Yakumo - Volume 2 Chapter 2

The world’s worst offense, is called Love.

Through a mysterious portal, Chen Jin arrived at this strange place – a post-apocalyptic world where civilization had been destroyed.

Travel through Naruto and become the son of an ordinary civilian Chunin.

In this life-like world,

He obtained the golden finger to speed up the practice of ninjutsu,

Let ninjutsu itself produce a magical change from decay.

The knife cuts the jade, and the water bomb breaks Suzuo.

- Description from novelbuddy

Thirty-three classmates hold a reunion after graduating. Tensions soar and old friendships are tested, as a strange turn of events lead them to follow the path of the ancient gods.