 If you liked
Full Metal Panic!
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 ...then you might like
Asu no Yoichi!
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The main male character are both clueless to regular ways of living. This is just a taste of comedy while full metal panic is widely more enjoyable
both male protagonist grew up in an unusual environment and both female protagonist always beats the male protagonist . . . i like full metal panic though, its because of the humor
Both have a badass fighter forced to go to high school who completely overreacts to everything and seems to always leave a trail of bodies, a blue-haired tsundere love interest who beats the crap out of said fighter, lots of "accidental pervert" situations, large amounts of slapstick comedy,and the list can keep going on and on.