Sigma Harmonics is a role-playing video game developed and produced by Square Enix for the Nintendo DS handheld game console. The game involves two friends who travel through time, attempting to restore an altered past and solve murders along the way. The game is played using the Nintendo DS system's "book" orientation. Solving one chapter's case changes the past, which leads to a new murder. The game is told through a series of illustrations like a book. The game features random battles but is told in a mystery story format. The story revolves around Sigma Kurogami, a high school student and "sound user" whose family guards a huge clock sealing off the demon Ōma. One day, his past is rewritten, causing chaos in his present. He then works with his friend Neon Tsukiyumi to solve an increasingly complex string of murder cases and return his life to normal. They use Sigma's abilities and the clock to go through time, and as each murder is solved, the future changes and unlocks a new history with other crimes to solve.
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