Synonyms: Voices in the Dark, The Dark Drinks Blood, Blood-sucking Darkness, The Ghosts of Golden Time, Roar of Ages, Mystery of the Haunted House, Glyceride, Greased, The Earth-bound People, The Call of the Condemned
Collection of short horror stories, while the ones featured in Fuan no Tane focuses on disturbing scenes that tries to cause a reaction of unease in the reader; Yami no Koe features background stories and characters more or less developed which get involved in terrifying situations.
Anyway, both manga will sure be a enjoyable read for every horror fanatic out there.
While both are horror anthologies, Yami no Koe has more girth to each tale. Fuan no Tane has short, quick tales that remind someone more of a myth or legend with little-to-no information surrounding it. It adds a surreal aspect to it that Yami no Koe doesn't have, but Yami no Koe is more like a one-on-one dialogue with every detail necessary to tell a horrific tale.
Both are anthology volumes that contain a series of horrific stories. Where Yami no Koe is more in line with the mystery of the horror bent on ruining things you once thought innocent, Kyoufu Kansen is more like a gory American made film on a low budget with gratuitous graphic violence.