[6] Naito didn't practice any martial arts as a child, but was a member of the soccer club in junior high school.
[9] He was fascinated by the submissions Sakuraba was able to pull off against foreign athletes in Pride Fighting Championships and soon found himself training at Paraestra Matsudo.
He defeated Tsubasa Fujikawa via guillotine choke in round two in the semifinals of the Rookie Flyweight Tournament.
[16] He won his next five fights to earn a title shot against reigning Shooto Flyweight Champion Shinya Murofushi.
[23] Naito made his next title defense against Brazilian Jiu-Jitsu World Champion Alex Silva on December 9, 2017.
After five rounds, Silva defeated Naito by unanimous decision to hand him his first professional loss and take the belt.
[26] Naito made the first defense of his second ONE Strawweight World Title reign against Joshua Pacio in a rematch from nearly two years earlier on September 22, 2018.
[31] Naito next faced Yosuke Saruta at Road to One 3: Tokyo Fight Night on September 10, 2020.