Amadeus, a former Japanese Baron's son, thought he had reincarnated into an Isekai as a handsome boy, only to find himself in a world where everyone you look at is beautiful. While immersing himself in the music he loved, he ended up rising to become a Count's son!? "If it's come to this, I want to enjoy music even more!" While earning funds with his past-life knowledge and gathering music comrades, one day, he met the Duke's daughter Giulietta, who is feared as a monster... But no matter how you look at her, she's a beautiful girl, right? What is going on with this world!?