Zetsubou no Kaibutsu
English title: Despair of the Monster
Japanese title: 絶望の怪物
Type: Movie
Episodes: 1
Source: Original
Genres: Drama, Horror
Duration: 29 min
Rating: R - 17+ (violence & profanity)

A story about fourteen-year-old alien girl Aoi Hoshino. Her family uses certain medicine to disguise themselves as humans.
For some reason the medicine slowly stops working, but only on Aoi...

(Source: Official Website, edited)