The protagonist is not a traditional academic, but a "wild kid" who grew up on a chaotic street tennis court. His tennis does not have any fixed style, relying purely on beast-like instincts, terrifying physical fitness and tricky shots honed on the streets (similar to the "unfixed shot" variant - "unfixed return").
Due to a conflict/bet, he was discovered (or forcibly recruited) by the coach of a famous tennis school (such as Fudomine/Josei Shonan).
