 If you liked
Bloody Monday
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 ...then you might like
Guilty Crown
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Both manga involved secret organisation, male lead with supreme ability (hacking in BM and the 'Power of king' in GC ). Both of the male lead seemed to be a useless high school kid at first glance. And both mangas give off exciting feelings as you continue further. (I would recommend to watch the anime version of guilty crown too.) Give it a go and you'll see what I mean.