It is a divine ritual, a martial art, a combat sport—it's sumo!! 

A "small" new student, Ushio Hinomaru, appears before the weak little sumo club of Oodachi High School! The words "big" and "heavy" are the rules to this sport, which does not fit this newbie any inch, but this guy goes and does what...!? Ushio and the small sumo club climbs its way to the top! 

The goal is Hinoshita Kaisan (A title for the highest rank in professional sumo, equivalent of Yokozuna)! 

A fired up high school sumo tale—no retakes allowed!! 

(Source: MangaHelpers)

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__Non-Anime Roles:__
- Zayne - Love and Deepspace (VG)

The weak sumo club of Odachi High School welcomes a new "small" member, Hinomaru Ushio. Everyone thinks he's too small for this sport, where having a "big" and "heavy" body is crucial, until they reveal his past! The goal is to become a yokozuna, the highest rank in sumo wrestling. Fired up high school sumo begins now!
 
(Source: Manga Plus)
 
Note: Includes 1 bonus chapter.

Nito is living a quiet high school life while taking care of his disabled grandpa, but thanks to an encounter with a schoolmate striving to be a pro female MMA fighter, his life is about to flip. Sometimes, you just have to fight! This serious MMA story is an all-out battle! (Source: MANGA Plus)

Chihiro Kunisaki