I'm afraid when something is truly lost, one can
never get it back again.
↳ ❝ The contract is the “scar” that the demon leaves so that he does not lose the person he contracted with. No matter where, the “contractor” has great authoritative power.
Yet, on the other hand…
He would never be able to escape from the demon. ❞
— Kuroshitsuji, Yana Toboso