Mayumi Ozaki
As her retirement drew closer, Shirai wrestled her final match for Union Pro on September 15, where she and Ladybeard were defeated by Gentaro and Kyoko Kimura. The following day, Shirai worked her final Pro Wrestling Wave event, during which she wrestled a series of five matches against Hikaru Shida, Ryo Mizunami, Yumi Ohka, Misaki Ohata and Asuka, drawing with Shida, defeating Asuka and losing the other three. On September 18, Shirai wrestled her final match for Oz Academy, where she was defeated by Mayumi Ozaki. Her final Ice Ribbon match took place the following day, when she wrestled a series of twelve one-minute matches against the entire roster. On September 20, Shirai produced her fifth M.I.O event in Korakuen Hall, which also served as her retirement event. During the event, Shirai wrestled three matches. First she teamed with Aoi Kizuki in a tag team match, where they defeated Mayumi Ozaki and Yumi Ohka with Shirai pinning Ozaki for the final win of her career. Then she wrestled the final singles match of her career, where she was defeated by Isami Kodaka. Finally, she wrestled in a six-woman tag team main event, where she, Misaki Ohata and Tsukasa Fujimoto were defeated by Hiroe Nagahama, Risa Sera and Tsukushi, who pinned her to end her career. Following the match, Shirai and Ohata relinquished their Wave Tag Team Championship.