The opening is about how war never changes but war literally changed with the invention of guns and then again during the colonization of America because of a new landscape and the advancement of fire arms. War literally always changes. Even now people get shot at from miles away instead of facing each head on.
So, like, are we supposed to understand any of this if we haven't even heard of the game before?
Because I am confused beyond repair. So far I've gotten that there are four groups and that aliens attacked? But they stopped attacking I guess? And now the four groups are fighting again? And why is everyone a girl and constantly wearing sailor attire? Are they not allowed to have casual clothes? So many questions...
So it seems this is heavily relying on the idea you've already played the game or know about the plot. So a great way to introduce new people. :( Force them to go and research it or give up on it because of confusion. This just is frustrating, to be honest. I'll try and understand though.