![Senyuu](https://gogocdn.net/images/anime/S/senyuu.1.jpg)
Other name: Pupa (ピューパ)
Description: 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.