When Hilde Ruth is put on trial for defending herself from a lecherous customer, she meets Viscount Logen Strauss, who reveals that she's actually the granddaughter of the powerful Duke Arpeggio! Eager to become a noble, Hilde happily accompanies Logen to her ancestral home. But instead of a tearful family reunion, she's coldly ordered to pass a test to prove herself worthy of the Arpeggio name. Under such circumstances, will Hilde successfully claim her spot in House Arpeggio?