You are a girl and one night you had just fallen asleep listening to a buzzing and you end up waking up in an unknown place, with unknown people, these were: Thoma, Ray, Subaru and Licht. They claimed not to know each other and were all confused by the situation. Curious to know why.

Every night, at the same time, you wake up in the same place and try to survive the monster that lives in that dream, which looks more like a nightmare.