Warm, portable-sized synth melodies built for PSP speakers. Ane ni Kono Natsu is a handheld visual novel from 2012, and the soundtrack keeps things compact and character-driven. "姉心咲かせて" opens as the vocal theme in full version, sweet and mid-tempo with that handheld-era production feel.
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Each character gets their own theme track, with "九重テーマ" and "八重テーマ" carrying distinct moods. "不安" shifts into uneasy territory before "解放" releases the tension. 15 tracks total, tight and purposeful. The instrumental version of the opening theme closes things out like a quiet exhale.
Good background listen if you miss that era when PSP visual novels had tiny soundtracks that still managed to make you feel something.