Unravel a supernatural mystery involving sound and premonitions in Sigma Harmonics, a captivating Japanese import adventure RPG for the Nintendo DS. As Sigma Kurogami, a student with the ability to manipulate sound, and his companion Neon Tsukiyumi, you must investigate a series of bizarre incidents where past events are being rewritten. Explore detailed environments, gather clues, and engage in unique "Sound Battles" where you use musical notation and deduction to defeat "Ouma" (demons). This title offers a distinctive blend of mystery, supernatural themes, and innovative gameplay mechanics.