広坂 楓

Hirosaka Kouta's younger sister. Calls her brother "Nii-san". An athletic girl, and is a member of school track and field club. Occasionally, she would quarrel with Kouta as a joke, but really never have an actual fight with him. She is really proud of her reliable brother, and love him very much as a family member. When Kouta's arms transformed into tentacles and raped her, she doesn't blame him for it. On the contrary, she lends him a hand and offered to do anything to help him control the tentacles.