Big vocal harmonies layered over fantasy synths, and it all just clicks. Ryuuyoku no Melodia is a visual novel from 2012 with a full vocal soundtrack that goes way harder than expected. Eternal Melodia opens with this soaring chorus that immediately plants itself in your head, while Fortissimo Sky pushes into faster, brighter pop territory with real energy.
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The instrumental versions strip everything back and you notice how tight the arrangements actually are. Shiny Butterfly has this sparkly, effervescent thing going on. Honestly the BGM tracks like 星空廻る carry their own weight too, all soft piano and gentle pacing.
If you're into Japanese vocal-heavy game soundtracks, this one delivers front to back.