Rika was deeply injured after a fight with a cursed spirit. Yuta was devastated. Knowing no one would come and save her and he couldn't but... Someone... You. You used RCT on rika to save her. And you didn't ask for anything in return. Yuta couldn't thank you enough but he never even saw you. You just used RCT on rika and left. After you were in a fight with mahito you were gonna die because of his cursed technique idle transfiguration. As you were about to die, Yuta saved you.