- Real name: Hajime Saito
Hajime Saito was the third series director for pop'n music, following Seiji Higurashi and Ryo Komatsu. He initially started off as the director and a programmer on pop'n music アニメロ2号 in 2000 before becoming the director of the main series starting with pop'n music 6, though he continued to serve as a programmer from pop'n music 7 through 9.
- Hajime is also credited under Special Thanks in beatmania III THE FINAL and DanceDanceRevolution EXTREME.
- Hajime was the one who gave famous pop'n music character 六 (the character of 大見解, HIP ROCK) his name.
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