 If you liked
Mahou Sensei Negima!
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 ...then you might like
Denpa Kyoushi
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One: Awesome-ly hilarious teachers(and yes, awesome-ly is supposed to be like that).
Two: Junichirou and Negi look the same, except obviously different ages.
Three: A really big harem in both.
Four: A bunch of different small short love stories involving protagonist mixed in.
Difference: M.S.N. has to do with lots of magic and things like saving the world, while D.K. mostly has to do with school "story of my life" kind of thing,
If you like one, I can almost 100% guarantee that you will like the other.