Hinomaru-Zumou

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.