"Cumulonimbus" builds like an actual thunderhead, layers of synth slowly stacking until the whole thing breaks open. Natsukumoyururu's 2013 Windows soundtrack splits between dreamy summer VN tracks and what sounds like a mystery investigation side story.
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"Lunatic dance" has this unhinged energy with erratic tempo changes, then "moonlight's solitude" goes completely still with ambient pads and lonely piano. The investigation tracks like "Jiken ga Okita" and "Sousa Hajimari" shift into uptempo detective mode with snappy percussion.
Two soundtracks living in one album basically. "Rencounter -heat mix-" takes an already tense track and cranks it further. If you like VN scores that surprise you by suddenly becoming a crime drama halfway through, this one keeps you guessing.