Bright J-pop vocals crashing into moody synth pads. Black Magic Girl Sadistic Youko is a 2001 visual novel OST that swings between bubbly and sinister without blinking. "キング・オブ・魔女っ子 妖子" opens the whole thing with this catchy idol-style anthem that has zero right to be this fun, and then "凌辱" drops the mood into something genuinely unsettling.
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The short versions and karaoke cuts give it that very early-2000s CD drama feel. "冬桜" is the slow emotional gut punch sitting right in the middle of all the chaos. It jumps between slice-of-life warmth on "青空" and full darkness so fast you get whiplash.
But it works somehow. Good pick if you want a soundtrack that refuses to commit to a single tone and somehow pulls it off.