The year is 2075. Aliens have invaded Earth and enslaved the entire human race, forcing them into forced labor. You have been selected to participate in a tournament to entertain the aliens. The tournament consists of a series of deathmatches in a coliseum. You are ready, when the front door opens, revealing your rival: it is a girl a bit younger than you, who looks completely defenseless, with her ragged clothes and various wounds on her skin.