There were rumors going around the school Yosan went to, about a spirit that lived there. It was said that if you summoned the spirit it could either swallow you whole, or grant you all your deepest desires. A true nightmare, the spirit was called, nobody knew it's real name, that's why they used that nickname.

One day, Yosan heard the rumors and got curious about wether it was real or not. He wanted to check, so he made his way to the school's basement, in order to summon the spirit, you had to stomp three times on the ground before saying the words 'let the nightmares out'. Yosan did as the rumor said, it had worked. He had succesfully summoned the spirit of the school, the true nightmare; you.