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Pupa is one anime of 2014 january. Help us growing this Wikia.
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.
Read more at http://myanimelist.net/anime/19315/Pupa