In a cultural exchange event between the modern era and the medieval isekai world, the present-day Prince and Princess plan to put on a classical piano concert for the Princesses and Royals of the medieval realm. This audacious undertaking is one that has never before been attempted, as the medieval isekai world is yet to be introduced to the classical sonatas, orchestras, or maestros. It promises to be a groundbreaking and innovative spectacle.