I was thinking lately, give that mother brain is an AI, and the battle grid looks a lot like a Holodeck, much like the possible simulation of Arsenal Gear in Metal Gear Solid II, so could it be that Phantasy Star II is just a simulation?
A very strange battle grid.
Very, very strange enemies.
A 20 year old government agent?
Party members who just happen to show up at the right time?
Getting conveniently saved, in space, from an artificial satellite on a self-destruct and crash sequence?
We can go on... thoughts?