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Koi wa 42°C is a romantic J-pop track set in a steamy hot spring at night.
It begins with playful energy, then gradually shifts into emotional heat as two people move closer.
The song captures the feeling of saying "I'm fine" while the heart keeps rising past its limit.
Cute on the surface, but subtly intense underneath, this track blends charm, tension, and sweet dizziness into one theatrical love story.
Blue Letter is a music project that turns nameless emotions and lingering feelings into sound. There is no fixed genre or form- only honest records of moments when the heart moved. Each song is written like a quiet letter, meant to overlap gently with someone's night or memory.
Blue Letter Records