In August 2011, Tomiya left Ice Ribbon and became a freelancer, adopting the new ring name Micro (ミクロ, Mikuro) in the process.

On September 11, 2008, Tomiya moved from her hometown of Utsunomiya, Tochigi to Tokyo to begin training professional wrestling under Emi Sakura.

[1] After less than a month of training, Tomiya made her debut for Sakura's Ice Ribbon promotion on October 7, losing to her trainer 3–0 in a five-minute exhibition match.

[8] On February 7, Tomiya faced one of her idols,[1] NEO Japan Ladies Pro Wrestling representative Tanny Mouse, in a losing effort.

[13] During 2009, Tomiya continued regularly wrestling Makoto, including losing to her on August 5 in a match to determine the number one contender to Ice Ribbon's top title, the ICE×60 Championship.

[15] On November 14, Tomiya formed the tag team named Miniature Dachs with Riho, with the two defeating Hikari Minami and Mai Ichii in their first match together.

[20][21] On June 17, Tomiya unsuccessfully challenged Matsumoto for the Triangle Ribbon Championship in a three-way match, which also included Tsukasa Fujimoto.

[22] On July 14 and 17, Tomiya scored back-to-back singles match victories over Matsumoto and her new tag team partner, deathmatch wrestler Jun Kasai.

[37] On May 5 at Golden Ribbon 2011, Tomiya unsuccessfully challenged Sendai Girls' Pro Wrestling representative Kagetsu for the JWP Junior and Princess of Pro-Wrestling Championships.

[38] Eight days later, Tomiya unsuccessfully challenged Tsukushi for the Internet Wrestling 19 (IW19) Championship at an 19 O'Clock Girls ProWrestling event.

[48][49] Back in Ice Ribbon, on July 22, an IW19 Championship match between Tomiya and Makoto ended in a nineteen-minute time limit draw.

[50] The reason for this was revealed the following month, when Tomiya announced that she, like Makoto, had decided to leave Ice Ribbon and try to broaden her capabilities as a professional wrestler by turning into a freelancer and opening doors to other promotions.

[51][52] Tomiya wrestled her final Ice Ribbon match on August 28, when she unsuccessfully challenged Hikari Minami for the ICE×60 Championship.

[61] Six days later, Micro made her debut for the Osaka Joshi Pro Wrestling promotion, unsuccessfully challenging Sawako Shimono for the JWP Junior and Princess of Pro-Wrestling Championships.