The life-and-death sibling story follows Hasegawa Utsutsu and Yume, 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: ANN

Note: The first eight episodes received an early screening at a special event on December 21, 2013, at AUON Cinema Makuhari Shintoshin in Chiba City. The regular TV broadcast started on January 10, 2014.

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