Rozemyne returns to Ehrenfest once more following her second term at the Royal Academy. Her days are spent in harmony as she meets her new little brother, searches for a laynoble retainer, experiments with cooking fish, and delves into her grandfather's past... but the undeniable fact remains that Ferdinand is acting unusually. At the heart of this mystery lies the mention of Adalgisa, and as Rozemyne ponders what it might mean, Ferdinand reveals a shocking truth.

"I should have died before my baptism."

The secrets about his birth, his final promise with his father, and a bitter choice... How will Ferdinand respond when the very future of Ehrenfest rests on his shoulders? Find out in the newest volume of this biblio-fantasy, which includes two short stories and four-panel manga by You Shiina.