[4] Mikuru started his interest in martial arts training karate in elementary school, however he also played volleyball for three years.

The Outsider brand was geared towards problematic youth, with focus on rehabilitating delinquents, criminals and gang members with MMA.

After winning his first amateur bout, against Kohei Shimada, with a first round rear-naked choke, Asakura put together a 6-1 record with 5 stoppages, only losing to Takehiro Higuchi.

Mikuru Asakura began his professional career in 2012 under the DEEP promotion, where he faced a fellow debutante Kavinesh Raviendaran .

[11] Four months later in his very next bout at The Outsider 38, Asakura beat Takehiro Higuchi (the sole man to defeat him to that point) to claim the 143 lbs Championship.

[13] Asakura would suffer his first career loss in a surprising unanimous decision to journeyman Kil Woo Lee during Road FC 43.

[18] Asakura employed an effective use of grappling and striking to outpoint the Kazakh fighter, and won a unanimous decision.

[19] During Rizin: Heisei's Last Yarennoka!, Mikuru Asakura fought another former Shooto Featherweight Champion - this time being Takeshi Inoue.

[23] Asakura scored a knockdown with seconds left in the bout en route to a unanimous decision victory.

[25] In a match against former TUF Brazil Team Wanderlei contestant, John Macapa, Asakura won a unanimous decision to hand the veteran just his 5th loss of his 30-fight career.

[26] At Rizin 21, Asakura faced TUF LA 2 Team Gastelum contestant, Daniel Salas as the main event.

[31] He faced Satoshi Yamasu, and won by TKO in the first round, after landing his patented head kick, and following up with punches.