A Japanese chef runs the Nekoya, a Western-style restaurant that connects to another world one day every week, bringing around all kinds of customers ranging from wizards and warriors to beastmen and dragons. One morning, the owner discovers a homeless demon girl named Aletta had wandered into his restaurant after coming across one of the Nekoya's interdimensional doors. She explains that she had come to the royal capital to make a living as a human, but lost her job after she was discovered to be a demon...