It's not a brainless novel, it has multiple female protagonists, complete ninja training levels, dual world switching flow, the pace is a bit slow, so be careful if you don't like it.
Uchiha Shiyuan was a time traveler. Unlike other time travellers, he had no system and accidentally awakened the Sharingan - but while others awakened the Sharingan and traveled through the ninja world, he awakened the Sharingan and immediately became terminally ill.
Unable to close his eyes, chakra was sucked wildly, and the dignified Uchiha genius became the laughing stock of the clan, the "Shame of the Uchiha". He lay there for ten years, and his life was not long in sight.
In order to survive, he risked his life and resorted to the art of counter-spirituality without a contract!
I thought I would be torn into pieces by a psychic beast, but when I opened my eyes again, I found myself in a strange and different world.
On this side of the ninja world, not only was Danzo concerned about his eyes, but World War II was about to start, and the strength of the genin could only be reduced to cannon fodder; on the other side of the world, gold leaves were all over the mountains and plains, and the happiness of wealthy dogs was simple and unpretentious.
Just when he was preparing to be submissive in the ninja world and strike hard in another world!
But he found that the development of things seemed to be different from what he expected.
It wasn't until many years later that Uchiha Madara watched his perfect Susanoo being easily broken into pieces, and began to doubt Ninjai.
Madara: Is this really a member of my Uchiha clan?
Black Zetsu: It seems... Right...
Shi Yuan: Jie Jie Jie, Madara, I, Shi Yuan, would like to call you the strongest.