He made a promise. He vowed;
"I will love and protect you forever—"
But in a world where heroes have become tyrants and the dead march alongside the living, promises are paid for in blood. Rhett's regeneration quirk grants him immortality—at the cost of dying over and over again, each death stealing fragments of his soul and memories.
He promised to save her, to save all the people he cared about.
Even if it cost him his life. Even if it cost him a thousand deaths. Even if it cost him his sanity.
"—Until death do us apart."
But what happens when death won't take you?