Bisco and Milo finally reach Konakidani when the Pipe Snake, a divine beast with two heads that's the size of a dragon, appears before them. That's also when Pawoo catches up to them with the worst possible timing. Soon enough, even Pawoo is dragged into the intense battle against the Pipe Snake. Meanwhile, Kurokawa also closes in around them...

Milo is left standing at death's door by Kurokawa's traps. Kurokawa has once again captured Jabi, and this time he shares a glimpse of his terrifying plan to utilize Tetsujin, the very same defensive weapon that covered all of Japan in the Rust Wind. It seems like no one can stop Kurokawa, and yet at the very moment Jabi feels that despair, a familiar face appears before Kurokawa...

The revived Testujin advances, destroying everything in its path. If this goes on Japan will once again be swallowed up by Rust... After inheriting the spirit of Bisco, Milo resolutely takes a stand against Testujin. Jabi, Pawoo, and Tirol race to his aid and they manage to corner the rampaging Testujin, but...

Tetsujin is heading for Imihama, repeatedly attacking Milo in a fierce assault. Yet just as he's about to be killed, Bisco revives from within Tetsujin. Together Bisco and Milo join forces in the final battle against Tetsujin!