Koisuru Tensei Seimukan wa Happy End no Yume wo Miru

Felciana, a girl who loves to read, is saved from falling down the stairs by a young man. He is Yuto Historia, the eldest son of a prominent family whom she last met when she was a child, and for some reason, he later proposes to her. Although the reason for his proposal is a mystery, she accepts his proposal.
After their engagement, the two gradually begin to interact, and Yuto, a cool government official, keeps making her heart flutter. However, it seems that Yuto has a secret...

In fact, this is the world of the game "Utopia," and Yuto is a reincarnated person!
Yuto has been in love with Felciana since before his reincarnation, and he uses all his knowledge of the game to try to get her to like him...!? A devoted and clumsy love fantasy!!

(Source: Nihon Bungeisha, translated)