If you liked
Mahou Sensei Negima!
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...then you might like
Mamoru-kun ni Megami no Shukufuku wo!
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They are both romance stories in school, and both have some sort of a "magic" related theme to it. Plus the boy is much smaller than the girl.
both are magic and kind of shotacon. This two anime have some of romantic and fighting part. Both have cute hero and also "tsundere" heroine.