Evolution Year. That is what people called on the year where everything changes. 2120, the green mist is suddenly appeared and covered the whole planet for a year. At first, this green mist look like not dangerous, but the green mist has been changing the gen of every living creature at the planet. It’s made the world threated by mutated beast and mutated human in every place. Fortunately, there is many people who can control their mutation and used that power to save the humanity. 500 year later, Hero became a common job for person who have controllable mutated gen. “You can’t be a hero.” Arville realized that his dream to become a hero are broken after doctor told him that he didn’t have controllable mutated gen. Born in a family where all of their member is a hero, Arville must accept that he didn’t have a power to became a hero. But he didn’t give up, even if he can’t be a hero but he will create the greatest hero organization!