Total Recommendations: 1
If you liked
Kami nomi zo Shiru Sekai
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...then you might like
Yahari Ore no Seishun Love Comedy wa Machigatteiru.
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They're both about loner high school kids and their love exploits. Both protagonists are cynical (though this manifests in different ways), both shows understand their characters well, both have harem elements (that are often subverted).