Tenkaichi: The Greatest Warrior Under the Rising Sun

🇯🇵テンカイチ　日本最強武芸者決定戦 · Tenkaichi: Nihon Saikyou Bugeisha Ketteisen

MangaSeinenOngoing🇯🇵 First published in 2021ActionFantasy

Yousuke Nakamaru story · Kyoutarou Azuma art

This is not history as we know it. The year is 1600. Ten years have passed since Oda Nobunaga unified the whole of Japan. When Nobunaga realizes he is nearing the end of his life, he announces that he will hand over the reins of power to whoever brings him the strongest warrior.

Synopsis via AniList