(The Demon Lord is the Hero's Cute Wife ~The Hero Betrayed by 4 Beautiful Girls in His Party Lives Happily with the Demon Lord. The 4 Girls are Criticized by the Whole World as Great Criminals Who Killed the Hero? Well, I Guess It's Karmic Retribution~) is a wildly popular light novel and manga series that perfectly captures the "betrayal and sweet revenge" fantasy trope.

The hero, now disillusioned, accepts the Demon Lord’s offer to live in her domain. She is not a monster but a beautiful, lonely ruler (another subversion). They begin a quiet, domestic life — cooking, gardening, and slowly healing from trauma. Meanwhile, the four heroines are celebrated as "hero killers" who saved the world from a "traitor."