No Littering

Both have same animation style and creators. Both make clay unbelievably disgusting. 

Both made by the same man Takena Nagao, so they have pretty much the same style both visuals, use of effects and there is a "meaning" in them both :) But really you shouldn´t be watching them unless you are really bored and don´t mind disturbing things XD 

Both are short, violent, horror stories with lot of gore about a date of a boy and a girl that gets interrupted by some sort of psychopath. Both feature character deaths. Both are made with slow-motion technique. Both were made by same director and have similar animation. Both are ONA.