Noblesse Oblige

Kouji was surprised when a beautiful girl appeared one day and said that she would be his maid. Yuria is part of the famous maid servant group called “Noblesse Oblige” (N.O.) which caters to the wealthy and famous. His grandmother had told him that wanted him to be the most loved in the world, but he never expected to have a maid servant. Not only that but shortly after, another girl showed up, as well as his childhood friend Ayana. What is going on here?