Wagamama High Spec's full OST is massive and it earns every track. This 2016 visual novel soundtrack covers everything from lazy afternoon BGM to full character vocal songs, and the range is kind of staggering. Shikakun no Waltz opens with this playful waltz feel that sets the cozy school-life tone perfectly.
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Fever Time cranks the energy up with a fast-paced comedic theme that practically sounds like it's grinning. The five character versions of Houkago Amazing Kiss are a neat touch, same song filtered through each heroine's personality.
Miracle Heart brings the big vocal hooks for the finale. Forty tracks deep and it still keeps surprising you. If you want a complete VN audio experience, this is the full package.