Megaton-kyuu Musashi Pilot

Earth has been devastated by the sudden invasion of the alien Dracters, forcing the surviving population into fortified shelters while much of humanity lives without knowing the full truth about the world outside. The resistance's answer to the invaders is Musashi, a gigantic machine built to challenge weapons far beyond ordinary human scale.

Yamato Ichidaiji, Ryugo Hijikata, and Teru Asami are students inside the shelter, but each possesses the aptitude required to pilot the three machines that combine into Musashi. Their school lives now stand beside a much larger responsibility: mastering a robot whose attacks are activated through special Memory cards and carrying humanity's counterattack into battle.