Train world where only trains live!
Kay, Alf, Duck, Selly, and other villages where robot train friends live.
Energy is supplied smoothly through tracks and tunnels.
But one day, Duke's betrayal suddenly blocked the tunnel, and a crisis came to the village,
The fastest train, "K," barely manages to save the village, but it loses its memory due to a downgrade occurs.
An unknown phenomenon occurs in Train World, which is clogged with tunnels. The temperature drops, the virus appears...
As their growth and adventures deepen, the darker the atmosphere becomes......