On January 8, 2012, Aikawa main evented Bull Nakano's retirement show, defeating Ice Ribbon promotion's ICE×60 and International Ribbon Tag Team Champion Hikaru Shida in a non-title Double Champion vs. Double Champion match. In February, Kairi Hojo and Saki Kashima joined Aikawa and Bito to form a stable named Zenryoku Joshi. Meanwhile, old rival Io Shirai formed the Planet stable with Arisa Hoshiki, Mayu Iwatani and Natsumi Showzuki, starting a rivalry between the two groups. The first match between Zenryoku Joshi and Planet took place on February 11, when Aikawa, Bito and Kashima defeated Shirai, Hoshiki and Iwatani, with Bito pinning Iwatani for the win. On February 26, Aikawa defended the Wonder of Stardom Championship for the third time, defeating Miho Wakizawa. On March 20, Aikawa and Bito made their first defense of the Goddess of Stardom Championship, defeating Natsuki☆Taiyo and Yoshiko. On April 8, Aikawa promoted the sixth Yuzupon Matsuri in her hometown of Niihama, Ehime, teaming with Kairi Hojo to defeat Nanae Takahashi and Yuuri Haruka in the main event of the show. On April 24, Aikawa made her debut for Pro Wrestling Zero1, defeating the debuting Yuhi. On May 3, Aikawa was scheduled to defend the Wonder of Stardom Championship against her tag team partner Yoko Bito, but the match had to be postponed, after Aikawa suffered a hip injury. Aikawa returned to the ring at a Stardom event on May 20, during which Zero1's Yuhi joined the promotion full-time, affiliating herself with the Zenryoku Joshi stable. On May 27, Aikawa and Bito made their second successful defense of the Goddess of Stardom Championship, defeating Miho Wakizawa and Nanae Takahashi. On June 3, Hiroyo Matsumoto left Nanae Gundan to become the sixth member of Zenryoku Joshi. Seven days later, Saki Kashima turned on the stable to join rival group Kawakatsu-gun. On June 24, Zenryoku Joshi was defeated by Kawakatsu-gun in an eight-woman battle of the stables. On July 8, Aikawa defeated former stablemate Saki Kashima in a grudge match, contested under lumberjack rules. On August 5, Aikawa defeated tag team partner Yoko Bito to make her fourth successful defense of the Wonder of Stardom Championship. On August 18, Aikawa returned to DDT Pro-Wrestling to take part in the promotion's 15th anniversary event in Nippon Budokan. Aikawa wrestled in a thirteen-person battle royal for the Ironman Heavymetalweight Championship, from which she was the sixth person eliminated by Yoshiaki Fujiwara, who went on to win the entire match. Later that same event, Aikawa took part in a "Handicap Rumble match", acting as one of Sanshiro Takagi's equalizer's in his match with Minoru Suzuki. Suzuki eventually got rid of Aikawa with an open-hand slap, before pinning Takagi for the win. The following day, Aikawa entered Stardom's 5★Star GP2012 round-robin tournament, suffering only the second singles loss of her career in her opening match against Kawakatsu-gun member Act Yasukawa. Aikawa, however, quickly bounced back from the loss, continuing her tournament by defeating Io Shirai on August 26 and World of Stardom Champion Nanae Takahashi on September 17. After a draw against Yoshiko and a win over Yuhi, Aikawa finished tied at the top of her round-robin block with Nanae Takahashi; however, her earlier win over Takahashi meant that she advanced to the finals of the tournament. On September 30, Aikawa defeated Kyoko Kimura in the finals to win the first ever 5★Star GP. On October 2, Aikawa and Bito were stripped of the Goddess of Stardom Championship, after Bito had been sidelined with a cervical hernia following her August Wonder of Stardom Championship match against Aikawa. The injury eventually led to Bito retiring from professional wrestling altogether. On October 14, Aikawa avenged her loss against Act Yasukawa by defeating her in a rematch for the Wonder of Stardom Championship. On October 27, Aikawa entered the 2012 Goddesses of Stardom Tag League, teaming with Zenryoku Joshi stablemate Yuhi. In their opening round-robin match, the two defeated Eri Susa and Nozomi. On November 11, Aikawa and Yuhi, now billed collectively as "Y Dash", continued their tournament with a win over Thunder Rock (Io Shirai and Mayu Iwatani). On November 25, Aikawa and Yuhi were defeated in their final round-robin match by Natsuki☆Taiyo and Yoshiko and, as a result, failed to qualify for the finals of the tournament. On December 10, Aikawa became the first wrestler to win the Tokyo Sports Joshi Puroresu Grand Prize two times in a row, this time finishing ahead of Meiko Satomura, Mio Shirai and Kyusei Sakura Hirota in the voting process.