Total Maidness!

The protagonists' parents were rich even before he was born, but his mother died when he was young, and he never really got along with his father. So poorly in fact, that they haven't talked to each other in ages and the protagonist has been living in his own flat for years, fully expecting to be disinherited.

Since finishing school two years ago, he's been idling away at a boring, poorly-paid office job and at home playing video games, not expecting much from life...

...until one day, his father suddenly passes away and he actually inherits his father's considerable riches and properties, including his mansion - and the maids maintaining it...