 If you liked
Rakudai Kishi no Cavalry
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 ...then you might like
Kishuku Gakkou no Juliet
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Both Shows have a Boy and a Girl from two different countries Falling in Love with each other and having a relationship after a duel with each other. In Both Shows the Girl is the daughter of a Noble, while the Boy has Family issues. They also try to keep their realtionship a Secret from the public.