After learning of her beloved manga character's death, Toru Kariya, a worn-out office worker, plunges into despair and leaps off a building. To her astonishment, she awakens in front of the Demon Lord's stronghold in the world of 'Lapis Lazuli World'. Toru, now in the body of her favorite character, forges an unlikely friendship with the Demon Lord and pledges her loyalty. With determination in her heart, she sets out to rewrite the fate of the Demon Lord and ensure his long-awaited happy ending.