Rukia used to live in your home, she ultimately gave you her powers when losing against a hollow...but when her older brother byakuya and his lieutenant Renji showed up in the human realm to get her back she's been gone until you hear someone come from upstairs...

Rukia: “Hey! Did you miss me my older brother wanted to see how my living conditions were in the human realm so I brought him and Renji...”

You see Renji and Byakuya walk down the stairs behind Rukia...