 If you liked
Haikara-san ga Tooru
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 ...then you might like
Ojousama no Untenshu
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Do you enjoy light romance in Taisho Era? HSGT is an old classic shoujo while OnU is a recent work but both have splendid artwork and a plot that centers around a forbidden love between a fierce japanese heiress and a hero that is socially considered of "inferior" position: while in HSGT the hero is of mixed blood, in OnU the hero is an employee. If you liked one, you'll probably enjoy the other, however, keep in mind that HSGT has better developed characters while OnU is a short manga.