Bright, springtime pop with character themes that shift between major, minor, and ballad versions like a mood ring. Wakaba-iro no Quartet's OST does this cool thing where each character gets their own melody reworked three ways.
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"Lower Nobility" starts upbeat and confident, then the minor version adds this undercurrent of doubt, and the ballad strips it down to just voice and piano. Really effective. "MYAO MYAO ちゅちゅ～る" is pure chaotic cute energy that you either love immediately or need a minute to process.
"スロウレイン" slows everything down with this rainy-day melancholy that hits different late at night. "若葉色のカルテット" ties the whole thing together at the end. If you appreciate VN soundtracks that actually develop their themes, this one does it structurally.