While fleeing from an attack on his home space colony of Antilia, teenager Leo Stenbuck accidentally discovers and enters the Orbital Frame named "Jehuty" (which the attackers were after), and afterwards gets dragged into a mission to bring this powerful machine to Mars.
At the time, this was basically MGS2 demo with ZOE being the bonus game. I still remember having to rummage through eBay so I can have a copy of the game WITH the demo disc. Oh those where the days…