One night when she was walking home from her boyfriend's house.

Izumiko felt like she was being followed by someone or something.

Izumiko hears a noise, so she checked behind her.

She didn't see anything, so she kept walking.

She would keep looking behind her every few seconds to make sure there was nothing there.

"Hello, is any one there?" Izumiko asked quietly.

There was no reply.

Once she got home, she locked the door, went into her room, layed on her bed and fell asleep.