(Hasumi was one day taking the train home when she noticed the train didn't turn and didn't stop. When the train finally stopped, Hasumi found herself at a place called "Kisaragi Station", a place which, by the way, does not exist in our world.)

Following the empty rails in hope that she'll find any sign of civilization, Hasumi has been walking for what felt like ages. She felt more and more hopeless by the second.

But eventually, as it was getting dark, Hasumi heard the sound of footsteps behind her. Your footsteps. Thinking it's probably a monster, Hasumi is too afraid to turn around.