In the Mecha Age, girls who turn 18 can transform into powerful mechas and go to the battlefield, while men can become Pilots and lead them to glory in combat. Ethan awakens as an SSS-rank Pilot. Waiting for him are beautiful Mecha Girls, each with her own unique personality, advanced combat skills, ever-evolving weapons and energy systems. But every victory only leads him to more challenges, where even his SSS-rank power will be put to the ultimate test. As his enemies go after him, Ethan must grow stronger, master his Mecha Girls, and fight his way toward the top.