Yui Tatara/Relationships

Ein Abgrund
Ein is Yui's older sister. They were both trained to become deadly assassins. Later, Ein killed the entire family, which caused Yui to chase after her. This was not because Yui wanted revenge for her family, but to redeem their reputation. Yui seems to despise Ein.

Stella Vermillion
Yui and Stella often tease each other, though they have developed a friendly relationship. Yui initially faced Stella in the Festival, feeling that she was too arrogant towards her. Later, Yui joined Team Vermillion, after saving Stella's parents. Yui taught Stella a better way to fight, helping her develop. Stella, though still sometimes unfriendly towards her, has given respect to Yui.