she was brought up by her aunt, but having no talent in studies and sports she was frequently scolded by her aunt due to her lackluster grades. During those times her cat Shi-chan was her only real emotional support, however, a few months prior to the beginning of the story, Shi-chan died, leaving Karin feeling very sad and alone. During one of her visits to Shi-chan's grave, she meets Kazune and Himeka, and the former cryptically asks if she is a "god". When she learns that her mother's ring allows her to borrow the powers of a goddess, she becomes a target by those after the rings, later revealed to be the Karasuma's, and thus is offered to stay with Kazune and Himeka at their home.
Source from Wikipeida