Braju~

"I want to be a strong man!" To make his dream come true, Miyazaki Miyao tries all kinds of martial arts, but quits after two weeks. He's short, skinny, and not very strong, and he's always told, "You have no talent!" One day, a student at his school invites Miyao to try Brazilian Jiu-Jitsu. Anyone can become strong! The story of a Brazilian Jiu-Jitsu "beginner" begins!

(Source: Kodansha, translated)