Return!. In order to revive her memories, Asuna uses a mysterious machine invented by Kurusu to send her consciousness to the past. ……That was when Asuna had just entered Shiratama Junior High School. Asuna, who joined the soft tennis club and met Kotone, invited her to form a pair with her, but she refused. However, when they practiced together, Asuna found out about her enjoyment of soft tennis, and she thinks that she wants to be paired with Kotone even more. Miki, a third-year student who can't stand her, suggests that Kotone pair up with Asuna just once and have her play a match against him...