Masaaki Noiri began practicing karate from a young age, and he competed in several youth K-1 tournaments before turning pro in 2010.
Noiri competed in the 2011K-1 World MAX 2011 -63kg Japan Tournament, defeating Ryuji Kajiwara in the quarterfinals before losing to Yuta Kubo in the semifinals. He went on to win the 2011 Krush Under-22 ~63kg Supernova~ Tournament title.
In 2013, Noiri won the Road to GLORY Japan 65kg Tournament. At GLORY 8, held in Tokyo, he competed in the -65kg Slam Tournament, making it to the finals before losing to Kubo.
Since then, Noiri has won the WBC Muaythai Japan Super Lightweight Title, the WBC Muaythai International Super Lightweight Title, and the K-1 -65kg Championship.