Sigma Harmonics is a 2008 role-playing video game co-developed by Square Enix and Think Garage, and published by Square Enix for the Nintendo DS. An expanded port for mobile devices was released in 2010 under the title Sigma Harmonics Coda. The storyline follows Sigma Kurogami, a member of a magical family based in Tokyo. He goes on a mission through time with childhood friend Neon Tsukiyumi after demons escape the family's imprisonment and rewrite history through a series of murders. The gameplay combines role-playing combat mechanics, and adventure-style investigation and storytelling.