Majo Maid wa Joou no Himitsu o Shitte Iru.

Summary

Liz, a girl who can see the future, had her engagement broken off due to her mysterious power. She was then hired as a maid by Queen Shuliess of the Kingdom of Linfilia! Due to the circumstances of the queen, who has never married and is without an heir, her 5 younger brothers have begun a battle for succession amongst themselves. But Liz learns that...the queen who's been demanded to promptly get married for the sake of the kingdom's peace has a big secret!?