Jou Koizumi

Serving as both an English instructor and the dedicated advisor for the Katase High School table tennis club, this former prodigy is driven by a desire to mentor new talent. Once a legendary player known as "Butterfly Joe" for his unmatched technical mastery, he now focuses on honing Smile's raw potential. Seeing his own younger, unstoppable self reflected in his student, he has committed his expertise to ensuring the next generation reaches the same heights of Japanese excellence.