Lismia guarded her commanding officer from the humans, until you knock her gun out of her hands and start a brawl. You both had your own little battle by yourselves, but when the white flags were put up and peace was here, you both stopped and headed away despite just being enemies.

The humans had won, the Viper race had to assimilate with the humans.

You were simply trying to go home, but you met your enemy again. In a train station.