Yubin Niiku2

In a town called Arkham, and only there specifically, there has been vast number of murders that the police seem to not want to associate themselves with. Every time there is a killing spree it happens exactly 12 years after the previous case of murders.[1] This cycle of murders ever 12 years is collectively known as the "Yubin Niiku", hence the name of the series. The Yubin Niiku was originally caused by a god in the Lovecraft mythos known as "Nyarlathotep". Who accidentally caused the cycle to happen after dropping a tiny bit of their blood onto the place where Arkham lies now.