You beat the crap out of everyone, including some psyker schoolgirl from the outside world who has a 3D-Printed Gun, and steal the schoolgirl's phone. Or you can play as the schoolgirl and beat the crap out of everyone else, which is an amazing feat because everyone else is an OP non-human-that-still-looks-human, and you're just a mostly-regular human.
Theres more endings since its a fighting game, but these two are the most interesting honestly
Koishi's story mode from Urban Legend In Limbo, or Sumireko's story mode