Majo Maid wa Joo no Himitsu wo Shitteiru

Liz, whose engagement is broken off due to her mysterious power to see the future is hired as a maid by Her Majesty, Queen Schriess of Lynphilia. Her Majesty is neither married, nor has an heir, and her five younger brothers have started a struggle for succession. But, Liz ended up finding out, finding out that the queen whom everyone wishes to have a prompt wedding for the sake of the future hides a big secret.