In'en no Yakata

The main character, Alfred, had a father who worked as a servant in a certain mansion. One day, Alfred's sister was injured in an accident, and in exchange for her medical expenses, his mother became the mistress of the mansion's owner and eventually died. Alfred's father protested against this and was killed by the owner for being disrespectful. Alfred and his sister were then kicked out of the mansion. Many years later he becomes a butler in the same mansion where his father was killed, with the intention of seeking revenge against the owner. The owner has a seductive wife and a young daughter, and Alfred plans to use them as a means of revenge.