 In response, the Federation establishes special forces units, such as the Titans and OZ.Other forces, such as the Demon Empire (from Brave Raideen) and Dr. Hell also threaten the Earth, but are pushed back by the teams of Mazinger Z, Getter Robo, and Raideen.In the year 186, the "Excelion" battleship (from Gunbuster) battle a force of STMCs (Space Terrible Monster Crowd) when they are suddenly attacked by another alien fleet, known as the "Aerogaters"...

From this point on, the player can select from either a super robot or a real robot storyline, putting the player in command of the "Grungust Type-2" or the "Huckebein MK II", respectively.