“Dilemma” by Rie Takahashi
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In a world without music, young Echo was there the day legendary “Player” Jimi Stonefree and his mecha disappeared while fighting the mysterious Earless. Ten years later, he meets an amnesiac young girl named μ (Mu) who has an input jack on her back. Could she be a “Player” like Jimi? Together they set off on a journey to unravel her past and save humanity.