Pupa is a tV short anime that premiered in winter 2014, produced by Studio DEEN.

About the production: the story comes from a manga, there are 12 episodes of about 4 minutes and its current status is "finished".

Its main genres are drama, fantasy, horror and psychological, with themes such as Body Horror, Gore, Cannibalism and Ero Guro.

On AniList, Pupa has an average score of 27%, an average score, and appears on 45,065 users' lists.

The "life-and-death sibling" story follows Utsutsu and Yume Hasegawa, a boy and his little sister who find themselves all alone. One day, Yume sees a mysterious red butterfly and her body undergoes a strange metamorphosis—into a creature that eats humans. Utsutsu struggles to find a way to restore his sister. (Source: Anime News Network)

Official synopsis from AniList.