Rinia began working as a temporary sister in the confession booth, thinking it would be an easy job just listening to visitors' confessions. However, on her very first day, her first confessor turned out to be none other than His Majesty the Emperor—known as the "Blood-Stained Emperor"—and the content of his confession was unexpectedly weighty. Though Rinia desperately tried to handle the emperor by the book, for some reason, he became attached to her...!?