Yume Hasegawa

Yume Hasegawa is one of the protagonists of the anime and manga series Pupa. She is Utsutsu's younger sister.

Biography
According to the manga, Yume was originally a monster that escaped from a laboratory. The monster entered Sachiko Hasegawa's uterus and it proceeded to copy everything about her into itself. This caused Yume to have the same DNA that her mother had.

As she grew older, she was abused by her father. Her older brother, Utsutsu, and her mother, Sachiko, also shared in the abuse. Sachiko eventually divorced her husband, and this forced the two siblings to look after each other.

Later on in life, Yume became infected with the Pupa Virus upon seeing a red butterfly. This caused her to transform into a merciless monster that had an insatiable urge to eat human flesh. Utsutsu was also infected with the Pupa Virus and he developed a regenerative ability. He then made the ultimate sacrifice, and he regularly allows his sister to eat him if it means that she wouldn't go after other people.

Abilities

 * Metamorphosis