Yume Hasegawa (長谷川 夢 Hasegawa Yume) is a sweet and well-mannered girl who lives with her older brother Utsutsu. When she is infected with the Pupa virus Yume becomes a violent monster who feast on humans or any living thing, even her own brother. - Pupa Wikia
Pupa
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.
