The world of Rivere is a land that flourishes with life and vigor. A place where species of many origins unite as one--or that was how it used to be 2,000 years ago. It all started when the goddess of chaos decided to "play her part" in this world. She installed the idea of the "seven deadly sins" into some races. Eventually, it spread like an epidemic, causing massive wars and hatred between races. Many died, and even some races are now extinct. What will you do in such world?