This is pure idol-pop arcade sugar and it hits way harder than it has any right to. Otoca D'or was a Konami arcade card game built around collecting idol characters, and the music collection goes all in on bright J-pop production.
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"My Precious One" has this sticky vocal hook that just loops in your brain for hours. "Kuroi tsuki no yuugi" flips the whole vibe dark with theatrical minor-key drama, almost like a villain's entrance theme. Then "Amanogawa yakyoku" pulls back into this dreamy ballad territory.
The orchestra and big band rearrangements at the end are a nice flex, proving these melodies hold up outside the arcade cabinet. Worth it if you're into rhythm game soundtracks or Bemani-adjacent stuff.