Ore to Hinadori: Kuzu Onzoushi ga Sutego wo Hirottara

Kagara Sosuke, the heir to a distinguished family, was born with everything people envy, but he had an arrogant and twisted personality. One snowy day, while on a boring outing as instructed by his parents, Sosuke came across a dying girl lying on the side of the road. On a whim, Sosuke saved the girl from being kidnapped by a homeless man, but the girl he saved showed no gratitude or fear; she simply remained expressionless. "I wonder what her face will look like if I make her cry." Driven by a twisted curiosity, Sosuke took the girl home and began to educate her himself. Before long, the girl grew into such an accomplished attendant that she became the talk of the town. This is a romantic story that begins with the twisted relationship between an arrogant master and an expressionless orphan. (Source: forcs, translated)