Early stage: The heroine survives under the Demon King's sword in various ways, and uses cuteness to forcefully recognize her father, becoming the only variable and joke in the Demon Palace.
Mid-term: The Demon Lord got used to her existence, and even though he disliked her, he began to protect her subconsciously, and even postponed his plan to destroy the world in order to find toys for her. The protagonist group of the original book appears and wants to kill the "little devil".
Later stage: In order to protect the heroine, the Demon Lord does not hesitate to become the enemy of the entire righteous path. The heroine discovers the tragic secret behind his destruction of the world, and decides to help him take revenge. In the end, she uses love and companionship to completely heal him and reshape the world.
