My Sister Who Regressed Wants My Fiance

I got engaged in place of my sister.

It was a command from our father, who always favored only my sister. After a week of travel, I finally arrived at the Duke’s castle.

“Oh, you’re finally here? Nereis.”

My sister, who arrived first, greeted me.

“I’ve changed my mind. So, you should give it up.”

Suddenly, my sister, who is coveting the position of the ghost duke’s wife, and the duke himself, who keeps approaching me, saying, “I like you.”

The situation only gets more confusing from here.

By chance, I discovered my sister’s diary, and it seems that she has regressed.

And now, that regressed sister is coveting my fiancé.