Every boy gets his own theme and then like five emotional variations of it, and somehow none of them feel redundant. Tokimeki Memorial Girl's Side 4th Heart takes the character theme approach and just commits fully. Kazama Reita's theme alone gets a cozy version, a piano arrangement, a serious arrangement, a nostalgic version, and a confession version.
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Each one recontextualizes the same melody to match a different emotional beat. Hiiragi Yonosuke's serious arrangement goes surprisingly dark and moody. The confession arrangements across all the characters are where it really gets you though.
So many feelings packed into key changes. If you play otome games and skip the soundtrack, you're missing half the emotional experience.