Ryu laughs at Jinpei, who is moving earth with the G-4 machine in order to shape a coral reef into a crescent form. The purpose is to turn this coral reef into a bait and lure Galactor there. Nambu goes along with the plan and hands over a special liquid which dyes things red. When something is coloured by that liquid, it is visible on a special radar and cannot escape.

G-4 is standing by on the bottom of the sea. Soon, Galactor's spy satellite discovers the crescent shaped coral reef. The order to move out goes to the sea bottom tanks in all the bases. Galactor approaches. When Jinpei fires the colouring liquid, the sea bottom becomes red as well and the radar becomes useless. When they learn that it's a fake base, the sea bottom tanks surface and head back to their bases.

G-4 follows them with the radar and discovers six individual bases which the Science Ninja Team destroys completely. Jinpei follows the very big mecha of Katse which is returning to the main base. Katse learns of his follower through a communication from X and, after firing the torpedos, sets the self destruct mechanism and escapes.

With the help of Jinpei's message, the Science Ninja Team follows Katse. But Ryu alone is worried about Jinpei, who is following the mecha, and follows him. Despite the fact that he's hurt when he puts himself between the G-4 and the torpedoes directed at it, they surface together, fleeing from the self destruction of the mecha.

The other three corner Katse's plane, but in the pilot's seat there's only a puppet. Once again, the Science Ninja Team has let Katse escape, but Ryu and Jinpei' are in a cheerful mood.