Sparkling pop vocals and bright acoustic guitar right from the start. Imouto Senbatsu Sousenkyo is a 2011 visual novel, and the OST is built almost entirely around variations of one central theme, Colorful Mirrors. The main Colorful Mirrors by kirina is this catchy, upbeat pop track that anchors everything.
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Then you get the title version, the acoustic version, the piano version, the karaoke version. Each rearrangement strips or shifts something and you hear the melody fresh every time. sawamurah handles the BGM side, and tracks like Koi no Iro and Imouto Harem keep things warm and playful.
Kanashii Sora brings a rare moment of sadness, quiet keys over a minor chord progression that stings. Worth it if you like hearing one great melody explored from every possible angle.