The manga focuses on the karate style, Kaburagi-ryu - a fictional martial art based strongly on Gōjū-ryū (剛柔流), which is one of the main traditional Okinawan karate styles with "hard-soft style" techniques.

In the manga, Kaburagi-ryu, is a full contact traditional combat style created by Kaburagi Juuzou, its 1st president. The current and 2nd president is Kaburagi Shigemi, Kaburagi Juuzou's second son.

The colors for each kyū, (rank before a dan/black belt) in Kaburagi-ryu karate.

Belt Colors

There are only four schools in all Japan that have Kaburagi-ryu karate clubs: Reinan University and Bubudai University are two of them reported in the manga

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