Keita Kawakami has become a hero in the Russian Far East. When he returns home to Japan, he is greeted not by cheers, but by a Defense Force in ruins…and the military academy’s annual festival. As part of the event, Class A is set to face off in a mock mech battle—but Keita won’t be piloting his personal unit. Instead, he’s assigned one of the mass-production units based on the Mikage prototype. What’s more, he finds himself entrusted with a special mission… As his classmates clash, the hero finally comes face-to-face with humanity’s greatest enemy!