Kuchibiru ni Dokuyaku: Shinazu no Ouji wa Kanojo no Ai de Nemuri ni Tsukitai

After losing her parents, Aina lives with her uncle, who inherited the Dukedom of Ashbel, but is oppressed by her stepmother and stepsister every day... Suddenly, her stepmother announces to Aina that she is engaged to be married to Earl Euston. It is not the marriage proposal she hoped for, but for Aina, it is a chance to be freed from her oppressive life. Her dream of gaining freedom is short-lived, as she learns that she has simply been sold to a pervert in exchange for a large sum of money, and she is overcome with despair. With no way to escape from her carriage, Prince Shion appears to save her! Although the prince tells Aina that he has been "looking for her all this time," Aina has no memory of even meeting him. Why on earth was she saved? What do Shion's words mean? And will the reunion of these two be a blessing, or the beginning of misfortune?

(Source: Cmoa Comics, translated)