MAL's Information lists this one-shot episode as Comedy, but it's actually a very understated horror short, and it is amazing. The plot is well paced, and the characters are both likeable and well-developed despite the short time that is allotted to character development in a single 25 minute episode. There aren't many shows that fit into the same genre as this short, but the closest that I can think of in terms of atmosphere and style is Steins; Gate. which shares many of the same understated elements and atmosphere. Fantastic episode left me wanting more because it was so perfect, but I'm glad it was exactly thelength that it was because it was perfectly made to fit into the single episode.