Bound to the Demon Butler
27 Episode
Lord Ryan, betrayed by Count Austen, loses his estate. Xavier, a Butler, protects him. He promises to help Ryan reclaim glory through a Soul Contract, with Ryan's soul as the price. They fight enemies, exposing Austen's conspiracy. When revenge is complete, Xavier cannot devour Ryan's soul and fades. Ryan uses his immortality to rewrite the contract, breaking the soul-devouring fate. They forge a new pact to share life and death, staying together.