[3] After a 6–9–1 career in Shooto and Lumax Cup, Kusayanagi volunteered for representing his promotion in Vale Tudo Japan in 1994.
He was paired against David Levicki, a wing chun specialist that outweighed him by 90 lb.
Kusayanagi charged at him with a takedown, but Levicki blocked it with help of his size and immediately started hitting the back of his head, which was legal under the rules.
After dropping Kusayanagi to the ground, Levicki hit him with more punches until knocking him out.
In 2019, Kusayanagi was arrested under suspicion of paying for sex with a 14-year old child in September 2018.