There are apparently two versions of this, one on CD and another on DVD. CD version requires DX8 and ~700MB disk space while DVD version requires DX9 and 1GB disk space. Beyond that I couldn't figure out what the differences are.
DVD version description: http://www.nitroplus.co.jp/pc/lineup/pro_04a.htm
CD version description: http://www.nitroplus.co.jp/pc/lineup/pro_04b.htm
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