Sigma Harmonics

Sigma Harmonics is a Role-Playing game, developed and published by Square Enix, which was released in Japan in 2008. 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