Total Recommendations: 2
If you liked
Rakudai Kishi no Cavalry
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...then you might like
Gakusen Toshi Asterisk
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Both series revolve around the same premise: a grand competition of strength via, in essence, qualification brackets. Very similar characters across both stories from the supporting cast to the main heroine as well as a "hidden strength" yet still mortal protagonist. Rakudai has a more compelling story and main character whilst Gakusen Toshi Asterisk strays towards a more generic anime style. However, there's no denying that the two are remarkably similar.
If you liked
Boku wa Tomodachi ga Sukunai
|
...then you might like
Yahari Ore no Seishun Love Comedy wa Machigatteiru.
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Ultimately, the premise, plot structure, characters, interpersonal dynamics, and the end result are all the same. If you enjoyed any of the elements of what makes Oregairu Oregairu, then you'll find Haganai just as enjoyable, and vice versa.