 If you liked
Zettai Karen Children
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 ...then you might like
Toaru Kagaku no Railgun S
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Both series are about superpowered children fighting against superpowered foes in a world of espers and science.
The kids in ZKC are gradeschoolers rather than middle schoolers but are part of an elete force that combats esper criminals. ZKC is however less serious than Railgun for the most part however, often protrayed through the fact that 'the children' are bratty and abuse their powers a lot.