“Fuan no Tane” is a Japanese horror manga series written and illustrated by Masaaki Nakayama. The comic series has also been adapted into a live-action film in 2013. Unfortunately, neither the horror manga nor the movies is easily obtained since they haven’t been licensed by others than Japanese distributors, but the comic has been translated into english and can be read on several horror manga sites.
Each story is a short, “non-complete” story, and serves more like an idea. Or, as the title of the first volume perfectly describes it: “Seeds of Anxiety”. You’ll find that their lack of any kind of closure is what makes them so effective and creepy.
Here’s the first episode, “The Playful Man” (remember to read from left ro right):