Not the Nanny, but the Fanfic Heroine

The All-Purpose Nanny Training Plan.

Sesshomaru: I don't eat human food.

Taotao: Of course, my lord. Please enjoy this steak! Would you like me to brush your hair?

Dazai: Taotao is such a useful woman!

Female lead: Lord Dazai, may I insult you by name? I've been working overtime for three months straight and sleeping only four hours a night. Get lost!

Just the everyday life of a combat-weak female lead working as a nanny in various worlds. The current lineup includes Inuyasha, Jujutsu Kaisen, and Bungo Stray Dogs.

Theme: Don't fear difficulties. Be brave and keep going.