Soft acoustic guitar and a voice that floats like the paper plane in the title. Kami Hikouki is a 2006 PSP single by Kana Uemura, and it is four tracks total, two vocal and two instrumental versions of the same songs. "Paper Plane" is this delicate, wistful pop ballad that barely weighs anything, and "Hey!"
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picks up the energy with something brighter and more forward. The instrumental versions let you hear how simple the arrangements actually are. Guitar, light percussion, and space. PSP-era J-pop singles had this intimate quality, like the music was made for headphones on a train.
Two songs, two instrumentals. Clean and unhurried. If you collect PSP-adjacent J-pop singles or just want something gentle for a quiet night, this is four tracks of calm.