Kengan Ashura (ケンガンアシュラ) is a Japanese manga series written by Yabako Sandrovich and illustrated by Daromeon. It was serialized on Shogakukan's Ura Sunday website from April 2012 to August 2018, with its chapters collected in 27 volumes. A sequel, titled Kengan Omega, began in January 2019.
It was adapted into an original net animation (ONA) series. The first 12-episode part premiered in July 2019 on Netflix; the second 12-episode part premiered in October of that same year. A second season premiered in September 2023 with a 12-episode first part; the second 16-episode part premiered in August 2024.
Summary
Since the Edo period of Japan, gladiator arenas have existed in various forms around the world. In these arenas, wealthy business owners and merchants hire gladiators to fight in unarmed combat where the winner takes all, called Kengan matches. Yamashita Kazuo, an average Japanese salaryman for Nogi Group witnesses a street fight in an alley between two mysterious fighters. One of the fighters, Tokita "Ashura" Ohma is scouted out by the Nogi Group CEO, Nogi Hideki, due to defeating their previous fighter in the street fight. Kazuo is roped into managing Ohma who joins these arenas only to devastate his opponents. His spectacular ability to crush his enemies catches the attention of big business owners, leading to his inclusion in the Kengan Annihilation Tournament under the invitation of Hideki. This tournament is held by the biggest CEOs in Japan and the winner gets the seat of Kengan Association chairman, a position which holds immense power and prestige. As the tournament unfolds Ohma tests his strength while struggling with his mysterious past coming back to haunt him as Kazuo struggles with managing Ohma and figuring out the true intentions as to why he was invited to this tournament.