PHANTASM (ファンタズム) is a fictional band from the Visual Novel (and later adapted to an anime) ChäoS;HEAd.
榊原ゆい (Yui Sakakibara) is the CV of Ayase Kishimoto (FES) and she perfoms the singer of the band in END PROPHECY (album) and 刻司ル十二ノ盟約 (Steins;Gate ED theme, single).
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