He also won gold medals six consecutive times in the Pan American Games Judo Championships: at 2011 Guadalaraja, 2012 Montreal, 2013 San José, 2014 Guayaquil, 2015 Edmonton and 2016 Havana.

[8] In 2009, Kitadai, who is Jewish,[9][10] won a bronze medal in the 2009 Maccabiah Games in Tel Aviv, Israel, at U60, beating American Lindsey Durlacher along the way.

[11] In 2011, Kitadai won the Pan American Judo Championships in Guadalajara, the 5th International Military Sports Council (CISM) World Military Games Teams in Rio de Janeiro, and the Pan American Games in Guadalajara, all at U60.

[11] On July 28, 2012, his 23rd birthday, Kitadai won a bronze medal in the under 60 kg category at the London 2012 Olympic Games.

In the repechage, he beat Choi In-hyuk, from South Korea, to advance to the bronze medal match.

[26] He participated at the 2016 Olympics, beating Walide Khyar and Tobias Englmaier before losing to Orkhan Safarov.

[15] Because Safarov reached the semifinals, Kitadai was entered into the repechage where he lost to Diyorbek Urozboev in his first match.