Hiromi Oka, the heroine, has just entered a high school renowned for its tennis club. She began playing tennis inspired by Madam Butterfly. She had hoped to enjoy playing tennis with her best friend, Maki, but the situation shifts when the new coach, Mr. Munakata, suddenly selects Hiromi as one of the players for the upcoming tournament and begins giving her rigorous training. She perseveres under any circumstances. The more training the new coach gives her, the better she seems to become. Eventually, she becomes the representative for the junior match tournament.