At the end of the 22nd century, the human race has created a new colony called Second Earth. After a mysterious terrorist attack, a unit made up of Buster Dress, an incredibly intelligent A.I. mech, have bee...

On the first day back after summer break, high-school student Aoba is attacked by a giant robot that appears out of the sky. As he's pursued through the city, his classmate Hina appears in a robot of her own...