Meldion Koushakuke no Waka Fuufu wa Sukoshi Kawatteiru.

Noishe, a count's daughter who was Japanese in her previous life, has a dream. That is to live a quiet, unassuming life. However, it seems that a flag has been raised with Charles, the son of a prestigious duke whom she meets at a ball... Why? Does the fact that she doesn't fall for the high-spec, sparkling duke's son mean that he thinks she's "interesting"? This is a typical flag from a shoujo manga that I want to break with all my might! And yet, I messed up. I accidentally revealed that I had a previous life. Since then, he's been courting me with great enthusiasm... I never thought he'd be so dog-like! A love comedy set in another world, between two aristocrats, Japanese in their previous lives☆

(Source: ComicWalker, translated)