Bright, sugary vocal pop hitting you right out the gate. Imouto Style is a 2011 Windows visual novel, and the OST is packed with character themes and mood pieces that feel like flipping through a scrapbook. swee-chu hits with that bouncy opening energy, and each sister gets her own theme.
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Yuuna no Theme and Ichika no Theme have totally different vibes but both nail the personality thing. The character writing shows through the music alone. Then you get tracks like Taisetsu na Omoide that slow everything down.
The piano gets real quiet and suddenly you're in your feelings about fictional siblings. Setsunakute Koishikute closes things out with this ache that lingers. Good pick if you want something sweet that occasionally punches you in the heart.