Mangas

Fuan no Tane

不安の種, 不安的种子, A Reason for Concern, Seeds of Anxiety
Horreur,  Psychologique,  Surnaturel
A collection of very short and mostly atmospheric stories dealing with urban legends, ghosts, and superstitions all organized around a specific theme (school, visitors, etc.). Some are just two pages long.

Kouishou Rajio

後遺症ラジオ, Kouishou Radio
Horreur,  Psychologique,  Seinen
A collection of horror stories.