 If you liked
Nanatsu no Maken ga Shihai suru
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 ...then you might like
Silent Witch: Chinmoku no Majo no Kakushigoto
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- Both are set in a magic academy
- Overpowered MCs with hidden powers to outsiders
- MCs are there to achieve their assigned missions, which no one should know about
- They form a group of friends with unique personalities and have personal development thanks to the MC