In a world, there are two different archetypes of creatures. The Humans and the Sins. To be even with the Sins, the humans have developed into personal strength technological advances and created heroes in which allowed them to thrive and develop. Ray Varl is a bit of a typical highschooler who recently got admitted to a school specialized in technical applications of a purlange. However he learns that the truth about the sins aren't as simple despite his resentment to them.