A soul from another world came to the chaotic world of the Warring States Period and became a comrade-in-arms fighting side by side with Uchiha Madara, a shadow walking together with one heart and one mind. Where will this strange world go, and whether there will be less regrets.
Invincibility, struggle for hegemony, and later cultivation of immortality
Well written, awesome. You are the next Jin Yong