The story that the practice match between Akadama Junior High School and the unknown Shiratama Junior High School was terrific had reached Misaki, who is the captain of the soft tennis club at Kurodama Junior High School, which has the ability to win national championships. So, Misaki orders Yura, who specializes in spying, to infiltrate Shiratama Junior High School. Yura, who is constantly surprised by Asuna and the others going diagonally upwards, joins the practice as a new member from the course of events, but for some reason, she is not wearing tennis wear, but a school swimsuit! What's more, Asuna and the others started practicing in school swimsuits!?