The story is set in a small Italian restaurant. Half-brothers Fuyuuma Amazuki and Haruyo Amatsuki, Haruyo's childhood friend, Torataro, and his friend, Sora, manage the restaurant, which is small but secretly popular but has a "secret menu" that solves the problems of customers who visit the restaurant. In fact, the younger brother, Haruyo, is the heir to the large company Amazuki Holdings, and according to his promise to his father, he has to inherit the family when he turns 30. As the deadline passes and his father's secretary, Kaede Kusumi, urges him to return to work, it becomes clear that her father is ill and has only a short time left to live. As if to coincide with his father's death, a mysterious man, Tsukasa Nitta, comes into contact with Fuyuma, and Fuyuma gradually changes from his previous role as an older brother. What is Touma's true purpose? (Source: Japanese = prtimes.jp)