Sebastian and Charon have plotted to disable Gaia, the computer system which controls Olympus' infrastructure, including the override circuits which safeguard Multi-ped Cannon.

However, it is discovered that the attack is just a cover for stealing information on one particular bioroid, Hitomi, a friend of Deunan and Briareos, whose DNA is the genetic key which will cause Gaia to shut down.

Sebastian converts to his full-military configuration and steals Multi-ped Cannon, while Charon—wearing a Cadmos suit which has been made faster through the removal of half the armor—takes Hitomi to the one surviving kiosk.

To cover his theft of the Multi-ped Cannon, Sebastian uses the tank and its weapons to cause damage in the city, while the director and Deunan rush to try to restart Gaia, by destroying the circuit module which keeps the system offline.

The most obvious feature is the long sensor antennae which resemble the ears of a rabbit, but which hold such things as a camera eye which allows him to see around corners without exposing himself.

Charon Mautholos, a natural human like Deunan, is a friend of hers and of Briareos, but he has become disenchanted with life in Olympus following the suicide of his wife, an artist who felt stifled by the pre-programmed environment.

Chris Beveridge of Mania gave the OVA a mixed review stating "The plot, though simplistic, does work fairly well as a sidestory for the manga.

"[1] Paul Jacques also from Mania, also gave it a similar review when comparing it to the 2004 film stating, "This original release has slightly better script dialogue (less one liners) than the 2004 version, but lacks the back-story to make you care about anyone.