Adventures of Yuki

It was an ordinary day for Yuki. She always went to school, but in the middle of the lesson there was an explosion. Yuki lost consciousness and when she awoke, she noticed that all her classmates and teachers were gone, and the city wandering strangers. She ran home and collapsed walls saw a dead stranger, and next to him his blaster. The girl took a blaster, and now she has to pass the long way home, killing all the aliens on the way.