I'd Rather Not Be Doting on the Crown Prince Who's Got a Crushed First Love ~The Duke's Daughter is Looking for a Husband~

"This is just practice, okay?" Charlotte is a slightly eccentric duke's daughter who loves gardening. Crown Prince Joele, her cousin, has been visiting her frequently hoping she'll fall for him, but his feelings have not come across at all. When Charlotte decides to start husband-hunting to help her family's financial troubles, Joele seizes the opportunity. He invites her to stay at the royal castle and attend a ball. Having successfully brought her closer, he begins to teach the inexperienced Charlotte what love is, step by step. After all, she needs to learn how to handle being alone with a man, right? https://www.cmoa.jp/title/350487/