murasame tooko

Tsukumo's older sister, a relative of Yuki, and also a Zweilt guardian. Her ring summons a massive sword named Eon (Eternity). She goes to the same high school as her brother, and their close relationship makes all the girls envious of her. She has a deep affection for Yuki (whom she calls Yuki-chan), telling him that "He is someone who is too kind for his own good" and asking him to call her by a more intimate name (Tooko-chan) instead of the formal Tooko-san. She is the guardian who interacts with Luka the most, and sometimes she blushes when near him. This is because in her past life, Tooko had a lover who looked much like Luka. (Source: Wikipedia)