Huh... So her aunt didnt like sexually abuse her? Then why did she turn out this way? Or maybe she did?
Did Sato kill a guy who kidnapped Shio and take his appartment? That was my theory from the start kinda (in early chapters it was kinda implied she took someones appartment, where the wording would not make sense if it was her aunt's)
Also poor poor shio just being locked inside alone the whole day.