[3] Due to her father's influence, she started wrestling from the age of 5 and belonged to "Tokyo Gold Kids" from the upper grades of elementary school.

[6][7] 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.

[8] 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.

[17] On August 18, 2019, Kanna faced future Invicta FC Atomweight Champion Alesha Zappitella at RIZIN 18 and won a split unanimous decision.

[23] Asakura faced the reigning Jewels atomweight and DEEP Microweight champion Saori Oshima at Rizin 31 - Yokohama on October 24, 2021.

[32] Asakura left her gloves in the ring following the bout signaling her retirement from mixed martial arts competition.

[34] They broke up at the end of 2019 after photos of Tenshin being physical with Rizin ring girl, Hakase Mai, leaked online.