Majo Maid wa Joou no Himitsu o Shitte Iru.

Liz, who has the ability to see the future, lost her fiancee for fear of her mysterious power. That was when Her Noble Majesty Queen Shuriez of Linfilia came along and hired her as a maid! Around Her Majesty, who has never married and has no heir, a struggle for succession has already begun among her five brothers. But then Liz finds out... that the queen, who needs to get married as soon as possible to maintain peace in the kingdom, has a big secret! (Source: Kodansha, translated)