Credit:https://www.webnovel.com/book/naruto-i-have-a-gravity-training-room_32403594300402105
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------------------------------------------------------------------------------------------------------------------------------Synopsis
Natsuki arrived in the world of Naruto. He chose to let go of the savior complex, respect the fate of the chosen one, and live only for himself.
Naruto: Sasuke!
Sasuke: Naruto!
Sakura: Stop it, you two! Don’t fight anymore!
The rain poured relentlessly. Off to the side, Natsuki snacked on sunflower seeds, casually handing some over to his girlfriend, Tenten.
Pain: He deflected my Shinra Tensei!
Obito: I just wanted to create a world with Rin... but that bastard Natsuki said “If there’s Rin, there has to be Kakashi,” and made me watch Kakashi unleash Kirin. Be born already!
Six Paths Madara: I acknowledge Natsuki as the strongest!
Black Zetsu: Natsuki, you bastard! Get your foot off my mother’s head!
Natsuki: Just Eighth Gate, Hiraishin, and Sage Mode—and I’m already the strongest in the shinobi world? Really?