Sanshiro Takagi
On December 18, Aikawa announced that she would retire from professional wrestling on April 29, 2013. She revealed that she had contemplated retirement throughout the year, feeling that professional wrestling had started to get too tough on her near thirty-year-old body, finally deciding to continue until Stardom's big event in Ryōgoku Kokugikan. On December 24, Aikawa received her shot at the World of Stardom Championship, which she had earned by winning the 5★Star GP, but was unable to dethrone the defending champion, Nanae Takahashi. Afterwards, Aikawa was confronted by her Zenryoku Joshi stablemate Kairi Hojo, who challenged her to a match for the Wonder of Stardom Championship. On January 11, Aikawa and Hojo signed contracts to make the title match official, after which Aikawa announced that it would also serve as the farewell match of the Zenryoku Joshi stable. On January 14, Aikawa defeated Hojo to make her sixth successful defense of the Wonder of Stardom Championship. On January 19, Aikawa wrestled what was billed as her final match in her home prefecture, when she, Hiroyo Matsumoto and Kairi Hojo defeated Eri Susa, Miho Wakizawa and Nanae Takahashi in Matsuyama, Ehime. On January 27, Aikawa made what was billed as her final return to DDT Pro-Wrestling, teaming with Sanshiro Takagi in a mixed tag team match, where they were defeated by Danshoku Dino and Yoshiko. However, afterwards she requested one final DDT match, a rematch with Dino and Yoshiko under "street wrestling" rules. On February 10, Aikawa made her seventh successful defense of the Wonder of Stardom Championship against Natsumi Showzuki. On March 17, Aikawa wrestled her final match at Tokyo's Korakuen Hall, losing to veteran wrestler Meiko Satomura. On March 27, Aikawa made her final wrestling appearance outside of Stardom, when she and Sanshiro Takagi defeated Danshoku Dino and Yoshiko, Jaiko Ishikawa and Kota Ibushi, and Michael Nakazawa and Miho Wakizawa in a 53-minute four-way DDT street wrestling match at the Hanayashiki amusement park. On March 31, Aikawa defeated Act Yasukawa to make her eighth and final successful defense of the Wonder of Stardom Championship. Two days later, Aikawa relinquished the title at a press conference, where the card was announced for the Ryōgoku Kokugikan event. On April 14, Aikawa took part in a special gauntlet match, where she faced every wrestler in Stardom as well as surprise entrant Syuri. Twelve of the matches ended in one-minute time limit draws, Aikawa won four of them and suffered her only loss in the final match against Yuhi. Later that same day, Aikawa took part in "Stardom Mask Fiesta", which saw her make her final appearance as Yuzupon Mask, teaming with Iotica, the masked Io Shirai, and Mexican legend Mil Máscaras in a six-person tag team main event, where they defeated Black Tiger V, Mayucica and Passion Seven. On April 29, Aikawa wrestled her retirement match in the main event of "Ryōgoku Cinderella", where she was defeated by Yoshiko.