Higurashi no Naku Koro ni

Synopsis

While studying Takano's scrapbooks, Rena discovers that Oyashiro, who is worshipped by the Three Families that run the village, doesn't actually exist. She discovers that the problem is a virus that causes its victims to go berserk. In addition, since the altitude and temperature are very specific for the survival of the virus, it is explained that this is what causes the victims to feel homesick when they leave Hinamizawa. This disease caused all the murders. As a result, she is being hunted down by people who appear to stop at nothing to keep this information a secret. (Source: Wikipedia)