yui's little sister

Elizabeth was Yui's step-sister. And even then she doesn't even know anything about her. Let alone the last name. all she knows is that she is a half wolf half human who suffers from a rare disease called Polycythemia Vera, a disease that causes the body to produce too much red blood cells. what will happen to her and the brothers? will Liz and her sister create a stroger bond or will things stay the same? read more to find out.