Influenced by his older brother who was learning kickboxing at The Palaestra Okinawa, he started attending the gym in his first year of high school and trained in mixed martial arts under Ryota Matsune's guidance.
"[8] On August 3, 2018, he made his professional debut against Yo Otake in the first round of the flyweight division of the Shooto Rookie of the Year Tournament, winning by first-round triangle choke.
On November 25, 2018, he rematched Ryu Oyakawa, whom he fought twice as an amateur, in the flyweight final of the Shooto Newcomer's Championship Tournament, winning by first-round guillotine choke.
[12][13] Won by rear-naked choke 61 seconds into the match against Yoshiro Maeda, ranked #5 in the world flyweight division by Shooto, on March 20, 2021.
[14] On July 4, 2021, he faced champion Tatsuya Fukuda at the Shooto World Flyweight Championship and won by first-round triangle choke to win the title.
[15] On November 6, 2021, he fought LFN flyweight champion Alfredo Muaiad at VTJ 2021 and won by first-round rear-naked choke.
Vergara at UFC Fight Night: Grasso vs. Araújo, winning by armbar submission in the second round.
[22] On February 4, 2023, Taira faced Jesús Santos Aguilar at UFC Fight Night: Lewis vs. Spivac, winning by first-round triangle armbar.
[34] The fight was then switched and Taira ended up headlining UFC on ESPN 58 against Alex Perez in the main event on June 15, 2024.