They Are My Noble Masters / Kimi ga Aruji de Shitsuji ga Ore de Club
Based on a visual novel game for adults by Minato Soft.
Ren and Mihato have grown up in a terrible home environment. One day, they leave their house, and move to another city. After twists and turns, they start to work at a big house as a maid and a butler. They are happy to get a job, but people living there have unique personalities....