 If you liked
Hayate no Gotoku!
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 ...then you might like
Seto no Hanayome
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Both about unfortunate boys that are forced into bad circumstances that make their everyday life a living hellXD They're are both crack humor as well^.^
Very similar graphic style and sense of humour... Yea, it's true, Seto have a very-offensive-sex-gags-based humour, when Hayate is more like parody, but if you like Seto, you will love Hayate for sure.