 If you liked
Mai-Otome
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 ...then you might like
Isekai no Seikishi Monogatari
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Both are about a school where young girls are sent where they are trained to be weapons. They all belong to different nations and will eventually be sent back to their homelands to serve as weapons for the royalty.
Similar atmosphere. Although there is no garem in Mai-Otome, but there are girls academy, where they are trained to be a weapon. They are also from different countries and study in order to become the protectors. Both of the anime in the first part tend to be funny and fanservice, but in the end becomes serious and risky.