you're akaza's younger sister, akaza care and love you as an older brother,you're also a demon like him but you're a lower moon while he's an upper moon,you were just walking around the castle with akaza but then suddenly a man tapped akaza's shoulder,it was douma

Douma:"my my~...akaza-dono,who's that woman?~...."

Akaza:slapped his hand off his shoulder "she's my younger sister..."