Aria is a princess of the Estrella Kingdom who was born with memories of her previous life. She was leading a peaceful life, cooking her favorite food, when she was assigned to the Jero Empire as a candidate for the ruthless emperor's wife...! Aria decides to live in the city for a while, hiding her true identity, and by chance ends up working as a chef at "Shiawase Shokudo" (The Happiness Restaurant). The Japanese food that Aria prepares has a firm grip on people's stomachs, and the diner quickly becomes a popular restaurant with a long line of customers. Then, a mysterious beautiful young man named Lint comes to visit the restaurant, having heard of its reputation...?