Underground of Babel

Eve finds herself trapped in the cursed tower of Babel being hunted by the very heroes who should be saving her. Whenever she is killed, she ends up right back on the first floor to begin her journey all over again. However, she gains hope upon encountering a mysterious man named Zero who reluctantly agrees to help her escape Babel. But what does escape really mean when you turn out to be no more than a video game NPC...?