Ubatta node wa Arimasen, Onee-sama ga Suteta no desu

Laura, the adopted daughter of the Falkot Count family, dedicated herself to her studies to repay her adoptive father for taking in a commoner like her. However, one day, her stepsister Christina suddenly disappeared, leaving behind a letter that read, "I've had enough of having everything taken away by my little sister, Laura."

As a result of this reckless act, Laura is forced to become engaged to Christina’s fiancé—the crown prince, Legato!?

An earnest (?) isekai romantic comedy about two people who always seem to get the short end of the stick!

Cmoa