Welcome to the Ballroom 6 - Tomo Takeuchi, Kodansha Comics

Fujita has drifted through middle school aimlessly, unable to find friends or anything that can hold his attention. Then, one day, he's attacked by a gang and saved by a mysterious man. But this isn't a karate master. Fujita's Mr. Miyagi is a ballroom dance instructor! Reluctantly, Fujita takes a few beginner classes, only to find his inspiration: an entrancing teenage dance prodigy named Shizuku. It's Fujita's first step into the high-octane world of competitive dance!