The 2006 anthology film Unholy Women gets an honorable mention on this list despite its flaws and lack of popularity or infamy. While all three short films in this anthology are good-to-okay in their own rights, the opening short film Katakata alone would have made for a fantastically creepy feature length film.

In the Katakata storyline, directed by Keita Amemiya, a young woman named Kanako is returning home from a date with her divorced boyfriend. After an earring hits her in the head, Kanako looks up just in time to see some heavy mass fall from the sky and hit her. Upon waking, she realizes she is an some sort of alternate dimension with a creepy little girl, ghostly citizens, and an antagonizing monster known only in the credits as "The Woman in Red".

The Woman in Red is absolutely terrifying. The nightmarish atmosphere that follows her wherever she goes, her slowly warping and changing appearance, and her grotesque expressions make her a Japanese horror villain for the ages. If only this short story could be adapted into a full-length feature film. Nightmare fuel, indeed.