Higurashi no Naku Koro ni

 Higurashi no naku koro ni (when cicadas cry) is the first horror manga that actually scared me. Before i read higurashi no naku koro ni my view on horror manga was that it never could be scary. I was quite wrong and Higurashi has left me in my seat urging for more yet not wanting to read on. Neither the Manga nor the Anime has been licenced yet so finding it in english will probably be quite hard for you. Basicly the story of higurashi no naku koro ni is that every year at the time of the watanagashi festival someone gets murdered and another disaperars.
It is belived that Oyashiro-sama is doing this and it has happened the last five years.
The Higurashi no naku koro ni manga has a quite uniqe story telling seeing as It is parted up in diffrent arcs. There is the question arcs which tells a story and lets you get a feel of the world of Higurashi no naku koro ni. and then there is the Answer arcs where you get an explanation for the Question arcs.
Higurashi no naku koro ni was originaly a PC game that became immensely popular in Japan and later Square-enix published the manga and anime.
The Arcs are as followed
question arcs
Onikakushi-hen (鬼隠し編 Demoning Away Chapter)
Watanagashi-hen (綿流し編 Cotton Drifting Chapter)
Tatarigoroshi-hen (祟殺し編 Curse Killing Chapter)
Himatsubushi-hen (暇潰し編 Time Wasting Chapter)

and Answer arcs
Meakashi-hen (目明し編 Eye Opening Chapter)
Tsumihoroboshi-hen (罪滅し編 Atonement Chapter)
Minagoroshi-hen (皆殺し編 Massacre Chapter)
Matsuribayashi-hen (祭囃し編 Festival Accompanying Chapter)

There are in all 12 Volumes of Higurashi no naku koro ni released with side arcs and extra arcs including the ones over.

Higurashi no naku koro ni is a really creapy and thrilling manga which i really recomend if you like that kind of stuff.