All of the monsters and anomalies are caused by a SCP Foundation containment breach/K-class catastrophe.
- Jossed: The game's version of Old Gods are the culprits.
The game takes place in a version of Kurôzu-cho during the curse cycle.
A haunted seaside town where contact with the outside world suddenly becomes impossible? Seems like a case of it. Though people getting obsessed with spirals has yet to be seen. You will eventually be able to stop the Old Gods... By summoning another one that is older and more powerful than the others.
Whether or not this will save the earth is debatable.