Home is where the pain is

Sachiko had a horrible past, just like everyone else in the Hyakuya Orphanage.
When she was taken into the orphanage, she immediately became close with Mikaela Hyakuya due to their similar pasts. When Yuuichirou joined their family, Sachiko became close with him too. She finally had the family she never had before. Too bad it all had to be brutally ripped away from all of them.
(Based off the manga for the most part)