Mayumi Ozaki
After a -year absence, Ohka made her return to Oz Academy on February 21, 2010, when she began working regularly for the promotion. In her return match, Ohka was pinned by the promotion's owner Mayumi Ozaki in a tag team match, where she and Dynamite Kansai faced Ozaki and Takako Inoue. Afterwards, Ohka turned heel and joined Ozaki's Ozaki-gun, which in addition to the two and Inoue, also included Hiren and non-wrestlers Mika Nishio and Police. Ozaki-gun was mainly involved in a feud with Aja Kong's Jungle Jack 21 stable. At the end of the year, Ohka won both the Special Award and Impact Award, the latter for the moment, when she joined forces with Mayumi Ozaki, as voted by the promotion's fans. On February 19, 2011, Ohka and Hiren unsuccessfully challenged Chikayo Nagashima and Sonoko Kato for the Oz Academy Tag Team Championship. On September 23, Ayumi Kurihara, Chikayo Nagashima, Hiroyo Matsumoto and Ran Yu-Yu joined Ozaki-gun, which was in the process renamed Seikigun, replacing the retiring Hiren and Inoue, who was kicked out of the group. On November 27, Ohka and Matsumoto defeated the Oz Academy Tag Team Champions, Carlos Amano and Manami Toyota, in a non-title match. On February 26, 2012, Ohka, Matsumoto, Nagashima and Yu-Yu had a four-way match to determine the number one contender to their leader Mayumi Ozaki's Oz Academy Openweight Championship. Ohka was eliminated from the match by the eventual winner, Chikayo Nagashima. On February 10, 2013, Ohka and Mayumi Ozaki defeated Akino and Ayumi Kurihara to win the Oz Academy Tag Team Championship. They, however, lost the title just 28 days later in their first defense to the team of Hiroyo Matsumoto and Tomoka Nakagawa of Jungle Jack 21. Ohka attempted to recapture the title from Matsumoto and Nakagawa with new Seikigun partner Mio Shirai on September 15, but the two were unsuccessful. When Shirai was given the storyline booking rights for Oz Academy's March 2 event, she handed Ohka and Mayumi Ozaki a rematch for the Oz Academy Tag Team Championship. The two were, however, defeated in the title match by Matsumoto and Nakagawa. On December 13, 2015, Ohka received her first ever shot at the Oz Academy Openweight Championship, but was defeated by the defending champion, Sonoko Kato.