18+ Mushoku Tensei II: Isekai Ittara Honki Dasu - Shugo Jutsushi Fitz

In the immediate aftermath of the mana calamity, Sylphiette finds herself teleported to the heart of the Asura Kingdom: the royal palace. Her sudden appearance accidentally saves the life of second princess Ariel Anemoi Asura, who has her sights set on becoming the ruler of the realm. Witnessing Sylphiette's talent with combat magic firsthand, Ariel recruits her as her bodyguard and right-hand woman, commencing their journey to power—which proves far more treacherous than first imagined.