 If you liked
Kami nomi zo Shiru Sekai
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 ...then you might like
Nisekoi
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Nisekoi and TWGOK are fairly light-hearted harem-style manga, with both stories taking place in contemporary Japanese school settings.
Both utilise back-story to drive the romance sub-plots, with Nisekoi adopting a fated-love scenario and TWGOK basing it's various character plots on a more supernatural stage.
The humour and slice-of-life elements also make both series easy to consume in either small quantities, or rush through in one long burst.