Fuga: Melodies of Steel 2, there's a thread of new info.

So,

the villain of the previous game continues to live on in the tank the kids are now piloting, it seems. (As some kinda AI.)

The fun twist now is that

when the party enters peril mode

he will activate the Soul Cannon of his own accord

and the player has to race the countdown before it fires.

That's smart! That's a fun way to force the hand of players who refused to acknowledge this system in the previous game.

Oh, and it's random.

We're just playing reverse-russian roulette now.