 Ishii failed the entrance examination for the Japan Shogi Association's apprentice school twice before finally passing it and being accepted into the school at the rank of 6-kyū in 2004 under the guidance of Shoshi.He was promoted to the rank of 1-dan in 2007, 3-dan in 2010, and finally obtained full professional status and the rank of 4-dan in October 2013 after winning the 53rd 3-dan League with a record of 15 wins and 3 losses.Ishii's promotion history is as follows