Utsutsu's little sister who is sweet and well-mannered.

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.
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(Source: Anime News Network)


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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&mdash;into a creature that eats humans. Utsutsu struggles to find a way to restore his sister.
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(Source: Anime News Network)