Shimizu Aki

Shimizu Aki is a female tennis player and the reigning champion of the All Japan Junior tournament. Despite her age and shy personality, Shimizu is a very strong player, who had won the All Japan Junior tournament as a freshman. Her technique has no wasted movements, is fast and accurate. Shimizu first met Maruo in the Kanagawa prefectural tournament when Maruo picked up her phone battery when she dropped it. [spoiler]Ever since then, she has slowly developed a slight crush on him.[/spoiler] (Source: Baby Steps Wikia)