Disclaimer: This song is copyrighted by Konami, therefore, I do not own this audio.
This is a different long version found in the IIDX 11 soundtrack.
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Song Name: ピアノ協奏曲第1番 '蠍火' (ロングバージョン) [Piano Kyousoukyoku Dai 1 Ban "Sasoribi"] (Piano Concerto No. 1 'ANTI-ARES' Long Version)
Artist: virkato
Genre: DIRGE
Game the Song Came From: ポップンミュージック 20 ファンタジア (Pop'n Music 20 Fantasia)