At school she gets tacks put in her shoes, glue put on her desk, her head shoved in a toilet, and even worse than that. At home, her older brother who is stressed from trying to live up to their father's expectations ties her up, strips her, and beats her to relieve his stress. All Aya thinks about every day amidst the hell that is her life is dying. But one day a strange website called "Mahou Shoujo Site" pops up on her computer. The next day, the bullies at her school push her past the limit once again, but this time things go a little differently.
In chapter 102, her father revealed that she's a adopted child.
In chapter 104, Juuni, one of the site admins, told her that Yatsumura was her only real family. She was her twin sister.