Asakura made her professional mixed martial arts debut on October 4, 2014, at the age of 17 when she faced Naomi Okaki at Vale Tudo Japan 6 and won by unanimous decision. Following this, Asakura compiled a professional record of 9–2, with wins over
Yasuko Tamada and
Saori Ishioka, before signing with the
Rizin Fighting Federation to join their Super Bantamweight World Grand Prix Tournament in December 2017.
Rizin FF Super Atomweight Grand Prix Victorious in the quarterfinals and semifinals, Asakura advanced to the finals, then competing in front of 18,316 fans in what was arguably the biggest women’s title fight in Japanese MMA history, choked out Shoot Boxing superstar
Rena Kubota to become the Super Atomweight Grand Prix winner. On May 6, 2018, Kanna Asakura faced Melissa Sophia Karagianis at
Rizin 10. She won the fight via three round unanimous decision extending her win streak to 7. After the fight
Rena Kubota entered the ring and challenged her to a rematch. Soon after the fight was made official, and scheduled to take place on July 29, 2018, at
Rizin 11 in
Saitama,
Japan. Despite several improvements from Rena, Asakura used her relentless pressure to win the bout by unanimous decision.
First title shot Asakura faced
Ayaka Hamasaki on December 21, 2018, at
Rizin 14 for the inaugural
Rizin Super Atomweight Championship. She lost the bout in the second rout via armbar. On March 9, 2019, she faced against
DEEP JEWELS Atomweight champion
Tomo Maesawa in a non-title bout at
Deep Jewels 23 and won via a unanimous decision. On June 2, 2019, Asakura faced
Miyuu Yamamoto at
Rizin 16. She lost the bout via unanimous decision. On August 18, 2019, Kanna faced future
Invicta FC Atomweight Champion Alesha Zappitella at
RIZIN 18 and won a split unanimous decision. On December 29, 2019, Kanna faced Jamie Hinshaw at
Bellator 237/Bellator Japan and won via a third round armbar. On August 9, 2020, she faced Mizuki Furuse at
Rizin 22 and won via TKO by pounding. On December 31, 2020, Kanna faced Ai Shimizu at
Rizin 26, winning the bout via unanimous decision.
Second title shot Asakura faced
Ayaka Hamasaki in a rematch for the
Rizin Super Atomweight Championship at
Rizin 27 on March 21, 2021. She lost a close bout via split decision. Asakura faced the reigning
Jewels atomweight and
DEEP Microweight champion Saori Oshima at
Rizin 31 - Yokohama on October 24, 2021. She lost the bout via split decision. Asakura faced the
Shooto Super Atomweight champion Satomi Takano on April 17, 2022, at
Rizin 35. She won the fight by unanimous decision.
Super Atomweight Grand Prix 2022 Asakura faced
Si Woo Park in the quarterfinal bout of the Rizin Super Atomweight Grand Prix at
Rizin 37 - Saitama on July 31, 2022. She lost the fight by unanimous decision. Asakura faced the
Mei Yamaguchi at
Rizin Landmark 5 on April 29, 2023, winning the fight by unanimous decision. Asakura faced
Rizin Super Atomweight Champion Seika Izawa in a non-title bout at
Rizin 48 on September 29, 2024. She lost the fight by unanimous decision. Asakura left her gloves in the ring following the bout signaling her retirement from mixed martial arts competition. ==Personal life==