Evolution centers around Mag Launcher, a jaunty young man with a mop of spiky red hair and a cybernetic frame strapped to his back. The CYFRAME is a large device from which a cartoonish white hand can protrude and whack enemies during battles, or it can be used for such things as zipping down a rope to escape a collapsing ruin, as shown in the opening movie. He is joined by the mysterious and silent Linear Cannon, a blond waif with huge pink eyes and strange powers. His faithful butler Gre Nade, the foxy Pepper Box, or the strange, small, and creepy kid Chain Gun can make up the third member of your party. The plot centers around Mag and company's excursions into ruins scattered throughout the Northrop Continent as they scour these huge multilevel dungeons for treasure and get rewarded at the mysterious Society that is devoted to these explorations. Just who is the enigmatic Linear, and where did she come from? Why is Eugen, the commander of a huge military force, so interested in her? What does she have to do with the CYFRAME Evolutia? And just what happened to Mag's father?