心の闇 is a somber, low-energy track by Rionos from TVアニメ『メルヘン・メドヘン』オリジナルサウンドトラック「MärMäd Musik」 (Complete Edition), released March 28, 2018. It runs 1:43 at 142 テンポ (284 テンポ double-time) in A♭ Minor (Camelot 1A).

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