[11] Following the folding of Gaea Japan in 2005, Yu-Yu began working as a freelancer though effectively making Oz Academy her new home promotion.

In Oz Academy, Yu-Yu became a two-time Tag Team Champion with Akino,[12][13] with the two representing Aja Kong's Jungle Jack 21 stable.

[17] On November 11, Oz Academy founder Mayumi Ozaki was announced as Yu-Yu's opponent for her retirement match on December 9.

[18] Having quit Jungle Jack 21 and joined the villainous Seikigun stable on September 23, 2011, in order to get another shot at the Oz Academy Openweight Championship,[14][19] Yu-Yu reunited with her old stablemates for her final self-produced event, titled Starlight's Regret, on December 2, 2012, which saw Yu-Yu, Aja Kong, Akino, Hiroyo Matsumoto and Tomoka Nakagawa defeat Carlos Amano, Chikayo Nagashima, Meiko Satomura, Sonoko Kato and Tsubasa Kuragaki in a ten-woman tag team match that lasted over an hour.

First she wrestled Arisa Nakajima to a fifteen-minute time limit draw and then won a twelve-woman main event battle royal, where all participants were dressed as her, scoring the last elimination over Kazuki.