Itou Junji: Collection

In the light of day and in the dead of night, mysterious horrors await in the darkest shadows of every corner. They are unexplainable, inescapable, and undefeatable. Be prepared, or you may become their next victim.

Sit back in terror as traumatizing tales of unparalleled terror unfold. Tales, such as that of a cursed jade carving that opens holes all over its victims' bodies; deep nightmares that span decades; an attractive spirit at a misty crossroad that grants cursed advice; and a slug that grows inside a girl's mouth. Tread carefully, for the horrifying supernatural tales of the Itou Junji: Collection are not for the faint of heart.

(Source: MAL Rewrite)

Note: Anime adaptation of stories from both the 11-volume Ito Junji Kessaku-shuu series and the Fragments of Horror book.