"Hadaka no Ouji-sama ~Love Kingdom~" ("Naked Prince-Sama") 2 volumes- ongoing by Komomo Yamada
Nanako is an orphan who grew up in a temple. Then one day her dad's friend invites her to move to Tokyo. There she meets her fiance and two more candidates. Just when I was starting to think there must be something more behind the story, I realized I was on the last page of the 4th chapter...
Thanks to Ashley for recommending this.