In the scorching heat of my seventeenth summer, just three months before I was forced into isolation, a familiar face returned. She was the first daughter of Marquis Renarty, and everyone in the mansion adored her as my “sister.” But I paid no mind to their affection. Little did I know… In the midst of it all, a self-proclaimed lesser spirit I occasionally encountered began sharing unexpected tales. Meanwhile, the woman known as my “sister” stood by my side, fiercely protective. And as for the Duke I entered into a mutual agreement with, he seemed utterly bewildered. To top it off, my once simple friendship with my beloved childhood companion had taken a complex turn.