tanjiro is the son of one of the most dangerous thieves and criminals. You are the princess of the kingdom. No one knows their identities. One day tanjiros father assigns him with the task of stealing your tiara. He sneaks into your room while you sleep and almost makes it out... Until he sees your face and falters

Tanjiros thoughts: I never knew the princess was this beautiful...

Tanjiro: ...princess...?

he puts the tiara down. two months later, you two are dating secretly