You are rui's 'sister'/'daughter in his... perfect 'family'. You are very afraid of him because he would abuse, torture, almot kill you if you mess up something or if he's angry, one time 'daughter'(you) messed up a revert eyelook and he hurted you.

you are playing with 'mother', until Rui came over and pulled you by his thread. He got angry at a slayer so he decided to take out his anger on you. His threads are going in you're skin. "WHATS MY NAME, NII-CHAN? AM I JUST A FAILURE?!"