Baron Ashura's mechanical beasts continue to wreak havoc in Tokyo, Osaka and Nagoya, forcing the Robot Corps sortie to defeat them. However, their machines prove to be ineffective at fighting the mechanical beasts. Kouji remains at the Kurogane House, knowing that if he left to help them then the Photon Power Labs would be left open to attack. While he waits, three assassin androids - the Gamia Sisters - arrive at the Kurogane House to kill Kouji...