“I, because I am going to marry the princess. So, go back to the village and marry someone else.” Maylene, the apprentice saint, has her engagement broken by her childhood friend who was chosen as the hero. Maylene searches for a new job. She is asked to work in the Demon World as a substitute for the former Great Saint, and she accepts the position… as the snack attendant at the Demon King’s castle?! Using her knowledge from her past life and bestowed magic, her days of cooking begin. Demon King-sama, who eagerly looks forward to snacks, and the fluffy Cerberus. Even the initially cold wizard, Tyran, gradually changes his attitude… “It’s just a thank you for the ice cream!” ―On the other hand, in the human world that Maylene left, something incredible is happening! ――This is the story of a discarded saint finding her place and becoming happy.