This is the first time the author has written a novel, and the writing is not good. Please bear with me, thank you.
Uchizumi told no one that when he was a child, he had a friend that only he could see. That guy often taught himself some strange knowledge, provided him with many new ideas and gave him many bad ideas. But I don't know why, he still falls into deep sleep from time to time, but as he grows up, the time he spends sleeping becomes less and less.
Later, Senna reached the age of going to the battlefield and doing tasks. He encountered an enemy who looked very similar to his partner and even had the same name, Senju Tobirama. It was also from that time that I learned that my partner came from another world and was a peer of Senju Tobirama. However, since his partner met Senju Tobirama and learned that the other party was his enemy, he has a new hobby (???) - Cheating "himself"
"Hey, get up! I went to see the Senju clan today. Senju Tobirama is going to go on a mission disguised as a woman today! Let's go and watch!"
"Are you... Really him from another world? Aren't you embarrassed? (It's your face in women's clothing!)"
"It's okay, he's more embarrassed than me anyway."
*Tobirama is Uchiha Izuna's back spirit, but he is a back spirit that can attack others and get hurt.
*Tobirama comes from a modern era with a chakra version, where ninjutsu and technology develop together, so he knows a lot and has many more applications of chakra.
*Tobirama and Senju Tobirama received different education since childhood, and their personalities are very different.
*Tobirama in the parallel world in the article is called Tobirama or, and this world is called Senju Tobirama or [Tobirama]
Idea: An interesting idea from the past