If you liked the Captive Hearts manga, the Anime-Planet community thinks you'd like:
Akari has no interest in Kabuki Theatre, but suddenly she finds herself as the assistant of seventeen-year-old Ryusei Horiuchi, a famous young kabuki actor. He's gloriously handsome yet socially awkward, and performs under the stage name of Shonosuke Ichimura. Akari and Ryusei's relationship is difficult at the beginning, but eventually the two find themselves falling in love. What challenges will Akari and Ryusei face as they try to maintain their relationship against all odds?
Both of these short shoujo series focus on romances that cross social ranks, so one of the lovers is always at a disadvantage. The form it takes differs between the series, but things are complicated in Backstage Prince and Captive Hearts.
Captive Hearts and Stepping on Roses focus on two people held together by obligation, a curse in one case and a contract in the other. Things are initially quite difficult for the low-class person, as he/she struggles with the complications of being a part of the mistress/husband's world. In spite of it all, some love manages to blossom anyway.
Ultimate Venus and Captive Hearts are mirror images of each other in a few ways: a rich young woman falls in love with one of her servants, and in both cases, she is fairly new to this lifestyle. The highstrung character and the calm character are flipped, but the dynamic between the couples feels similar to me. :)
Sachie Wakamura's mother has just passed away, making her an orphan. Suddenly, a man claiming to be her grandfather appears asking Sachie to live with him. Things aren't as simple as they seem to be when she realizes her grandfather is the boss of a yakuza gang and she is to live with him and the rest of his men. To make matters worse she is assigned a bodyguard named Rakuto, who is the handsome, popular student council president at her new school. Sachie must now try to fit in with her new family and deal with her developing feelings for Rakuto, who appears to only see her as the granddaughter of his boss. Are Sachie and Rakuto destined to continue in this master-servant relationship forever or will her feelings finally be reciprocated?
Captive Hearts and Wild Ones are both shoujo mangas about a high-class girl and a low-class boy, though there's a slight difference between heiress-thief and yakuza princess-caretaker. :) Regardless, everyone has to figure out whether or not their feelings are genuine, appropriate, or a mistake. If you like one, try the other!