Marco was a mad scientist who had sacrificed his entire life to prove that elements existed beyond 118. He was on the verge of discovering it when a strange distortion pulled him into a world of periodic elements. In this world, people would awaken a Resonant Core, a structure similar to the periodic table inside their hearts, allowing them to attune to any of the eighteen groups and obtain powers from the elements within those groups. Marco never expected to have a nineteenth group slot in his Resonant Core. And oddly, this nineteenth slot was already filled....