Kosuke is reincarnated in the world of Naruto as a 12-year-old boy in the ninja village of Rain after World War II, and with a black rinnegan and a mysterious tattoo on his right arm, he will walk the path to power. Knowing Rain Village from the perspective of someone who actually lived there, Kosuke wants to bring prosperity to the people who have suffered so much for the great ninja villages. Konoha wants to use my village as its backyard? Not with me here. Cloud Village thinks it can come to my village looking for someone? Face my Black Rinnegan! This is the story of how Kosuke found himself in the ninja world and showed the strength of a true ninja village!