Three years have passed since the initial events of the series, during which Hiromi has dedicated herself to improving her skills with the guidance of her coach. Her hard work has paid off, as she is now recognized as Japan's junior champion. The coach's efforts have also been rewarded, as he has been appointed as the head coach of Japan's Tennis Selection. With a desire to offer his younger team members a new experience, he plans to take them on a trip to the USA. The dynamic between Hiromi and her coach transcends the typical relationship between instructor and pupil, developing into a poignant and intimate bond.