Why are we friends again?

"Rin Akechi sat in her dorm room looking at her phone. She had four missed calls, and she really didn’t want to call one of the two people back. So she squared her shoulders and pressed the digits she knew so well and waited.
“Hi, Rin.”, the voice greeted her, she knew the voice all to well as it was her adopted father who was married to her biological aunt who took her and her three siblings in after her father went on a drug-fueled binge and ended up dying because of it. Yuki on the other hand becomes the only light in her life. Rin carries this friend to explore life.."