Jack, Kento, and Terry, three juvenile boys and best friends from a town in the Empire, regularly visit the Nekoya through their personal secret entrance to partake in its hamburger menu; the restaurant's extremely diverse clientele inspires them to become adventurers and explore the world once they come of age. After the rest of the day's customers are gone, Alphonse Flügel encourages Aletta and Kuro to participate in a trial of the Master's latest curry dish variants.