• Chai, the protagonist of a rock star dream. He decided to play the spotlight in the worst way! • With an accident during a robot transplant experiment, a music player embedded in your body and became a "defective"! • Take on the hypnotic tech company that pursues him with his unique friends. The world moves according to the rhythm of Chai's "Heart" of music. Ride on the beat! • The non-stop, exciting, exciting battles begin!