One common theme is the unknown. For example, in 'Uzumaki', the source and purpose of the spiral obsession are never fully explained, which creates a sense of unease.
Another is 'Tomie'. Tomie is a beautiful but cursed girl. Every time she is killed, she regenerates in a more grotesque and menacing way, bringing horror to those around her. The manga plays on themes of beauty, envy, and the uncanny.
The unique art style. Manga artists can create really detailed and disturbing visuals that enhance the horror. For example, the way they draw distorted faces or eerie landscapes.
Another is 'Tomie'. The story revolves around Tomie, a beautiful yet sinister girl who has an uncanny ability to make people fall in love with her and then drives them to madness and violence. It's full of disturbing and spooky elements.
Well, 'The Enigma of Amigara Fault' is a great scary manga short story. In it, there are these strange holes in a fault that seem to be shaped exactly like human figures. People become obsessed with climbing into these holes for some unknown and eerie reason. Also, 'Franken Fran' has some really disturbing short stories. Fran is a mad scientist girl who does all sorts of grotesque experiments that will give you the chills.
It could be the way the artist draws the shape and size of the eyes, or the expression given to them. Maybe the use of dark shading or intense colors makes them look scary.
What makes a scary story truly scary is the element of the unknown. When there are things that are left to the imagination, it scares people more. For example, in a story where there's a strange noise in the attic but you don't know what's causing it. It could be anything, and that uncertainty is terrifying.
The sense of mystery in scary manga short stories is appealing. For example, in stories like 'The Enigma of Amigara Fault', the unknown factor of why people are drawn to those holes keeps readers hooked. They make you wonder what will happen next.
There's a short manga called 'Franken Fran'. It features a mad scientist girl named Fran who performs all kinds of grotesque and disturbing surgeries. The art style and the stories within are full of horror elements. It's not for the faint - hearted as it often plays with themes of body horror and the abnormal.