Houtou Ryoushu to Utsukushiki Otome

As her guardian, he is supposed to protect her, but he finds himself falling for her... At the beginning of the 19th century, Gray, an English aristocrat, had been neglecting the estate he inherited from his late brother, never visiting it and leaving everything to the housekeeper. But when he heard a rumor that the servants had left and the mansion was falling into disrepair, he hurried to drive the carriage. As he stepped into the dark mansion, he hears the words, "Stop! A gun is aimed straight at your heart!" from a young woman, seemingly alone. She seems to have mistaken me for a bandit. The shot hit him in the arm, and he looked at her in the moonlight... there she was, breathtakingly beautiful.