Denpa

Denpa games are a subgenre of horror eroge, popularised by the 1996 Leaf game 'Shizuku' which also lent the genre its name. The typical model is a horror story where the catalyst for the events that occur are based on familiar people acting in unfamiliar, yet seemingly orchestrated ways. Stories where the world seems to have gone mad; and the protagonist is not necessarily an exception. The name comes from the idea that electromagnetic waves (denpa) is causing people to act strangely (although it is rarely anything that mundane).

Description from a Subarashiki Hibi review by Asceai.