Ayaka Kamiya

Kamiya Ayaka is the younger sister of Kyousuke.

Appearance
Ayaka in the first two volumes wore a normal white school uniform. But after she transferred into the Purgatorium School of Rehabilitation, she wore the school's uniform which consisted of a black and white outfit. Throughout the series, she wears her hair in two pigtails with ribbons.

Personality
Ayaka cares about her older brother so much that she's willing to do anything to protect him.

After finding out about her brother was in the rehabilitation school, she was devastated. Eventually she ended up transferring into his class for attempting to murder a class full of students with a shotgun, but didn't actually kill anyone.

Ayaka used to be rude to any female student that got near Kyousuke, but after almost injuring and/or killing students with a shotgun, saying that Kyousuke was "defiled" by his classmates, she started to open up to people and approved of Renko's will to be with Kyousuke as she requests to be killed with Kyousuke when the time comes so they can be together and for that to happen, they both need to not kill anyone.