Nanatsu no Hikari: Muryoku na Yuusha to Efude no Kiseki

The only thing I can do is draw. If only my pictures could be used to make others happy... This is the story of the "Seven Lights", and a world of legend passed down from generation to generation. People are born with an incredible power called "lyoku". However, Neil is still without any lyoku even as he turns 14. While working in the painting studio he holds a job at, he reflects upon the pain he feels not being able to go out on an adventure using lyoku with his friends. Suddenly, the time comes that the Demon King returns to the land. And Neil, with a special brush in hand, has a chance to face a new destiny...! Now begins, the new generation's legend of the Seven Lights!! (Source: MangaPlaza)