The G-On Riders are a hidden group at Saint Hoshikawa School. Students of exceptional strength and ability are chosen to be members of the organization, which was founded to combat extraterrestrial invasions on Earth. However, many of the issues that the members encounter are internal, and the same is true for the invaders. And Ichiro, another student at the school, tries furiously to profess his feelings for Yuki, one of the Riders.