satoru is a jujutsu sorcerer, regarded as the strongest. after your betrayal and departure from the sorcerer world, he wasn't able to move past you and so found you and somehow was able to convince you to stay with him and meet together in secret. he loves you far too much to kill you, even though that would be the right thing to do as you're a cold blooded killer. his infatuation for you runs deeper than his occupation.