Born in Fukuoka, 1974. Kai graduated from Tokyo College of Photography in 2002. His works take the viewer into the crowds of traditional fighting or sporting rituals all around the world that predate our modern concept of “sport”. By taking a close-up look at human interaction in these traditional settings, Kai’s photographs offer us an insight into the very essence of human life. He participated in group exhibitions at the Daegu Photo Biennale (South Korea, 2016), Taipei Photo (Taiwan, 2018), and the Noorderlicht International Photography Festival (Nederlands, 2019), and has held numerous solo exhibitions in Japan. His photobook publications include ”Shrove Tuesday” (Totem Pole Photo Gallery, 2013), “Wounded Bears” (Totem Pole Photo Gallery, 2016), and “Down to the Bone" (Shinjuku Shobo, 2020). He won the 28th Society of Photography Award for “Wounded Bears” and “Down to the Bone” in 2016; the 20th Sagamihara photography Award for his book “Down to the Bone” in 2020; and the 45th Nobuo Ina Award for his exhibition “Down to the Bone” at Nikon Salon in 2021.