In September 2010, Saitō was accepted into the Japan Shogi Association (JSA) apprentice school as a pupil of shogi professional Toshio Miyata [ja] at the rank of 6-kyū.[2] He was promoted to the rank of apprentice professional 3-dan in 2015, and obtained full professional status and the corresponding rank of 4-dan in October 2017 after winning the 61st 3-dan League (April 2017 – September 2017) with a record of 14 wins and 4 losses.[3]