A newlywed wife who was told by her cold-blooded duke husband on their wedding night "I will never love you" endures unreasonable mistreatment while becoming addicted to drugs, and as a result—

Before I knew it, I had been reincarnated as a mob character in the world of a novel I had read in my previous life. My role was that of a maid in a duke's household. I served my master, the hero, while watching how events would unfold. Then one day, the heroine who had entered into a political marriage with my master arrived at the mansion. The lady of the house, the heroine, had been told by my master on their wedding night that "I will never love you," and she seemed to be deeply depressed. I thought to myself, "In the original story, the heroine was supposed to be a bright and earnest person who wouldn't be discouraged even if my master treated her coldly—she was supposed to be a strong woman," but I didn't pay it much mind at the time. Eventually, after enduring continued coldness from my master, the lady fell into mental illness. And in the end, she came to rely on sedatives obtained from the black market...