She is a history teacher at Hakuō Academy and doubles as a 24h gate guard. She lives at the Hakuō campus because of her trouble with money - she's spending all on alcohol she drinks non-stop.
Even though she's stupid, weak-willed and careless, she really cares about Hinagiku. Katsura sisters had lost their parents early and it was Yukiji who then took care of a little child that Hinagiku was. Back then Yukiji planned to change the world with her guitar skills, but she abandoned the idea after experiencing harsh reality. Yukiji is, ever since that old times, a crush of another Hakuō Academy's teacher's - Kaoru Kyounoskue's.