Virtual Station is a launch point for prehistoric adventures that span thousands of centuries and beyond! Using powerful technology, children known as "Gene Divers" are able to enter a virtually-reconstructed representation of the past in order to obtain genetic samples of extinct animals. Yui is one such Gene Diver who, while on a routine mission, encountered a hurt baby animal. With fellow Gene Diver Akira's help, the two sneak into the facility after hours and send Yui back to the past to help the animal out; yet due to a strange failure, this sequence of events causes a new race of rodent creatures known as Puglaistig to appear in the virtual world. With the system out of control, Yui, Akira and the robot Kotetsu must try to put a stop to the Puglaistig's nefarious plans: to travel to the birth of mankind, and stop the human race from existing!