Kizu made his club debut for Toyota Verblitz in 2018. He then made his international debut for Japan against Fiji on 27 July 2019 at the 2019 World Rugby Pacific Nations Cup round match where Japan defeated Fiji 34-21 and later Japan went onto win the tournament for the third time.
He has represented the Brave Blossom 3 times and was named in the nation's squad for the 2019 Rugby World Cup. He is yet to make his Rugby World Cup debut as the side heads into the quarter finals of the tournament.
|2018 - present|
|2019 - present|