If you liked
Kami nomi zo Shiru Sekai
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...then you might like
Yahari Ore no Seishun Love Comedy wa Machigatteiru.: Monologue
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Anti-social protagonist is forced to interact with females in a high school setting.
If you liked
Nazo no Kanojo X
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...then you might like
Yamada-kun to 7-nin no Majo
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A Girl and a boy share an atypical bond that is triggered by kissing/saliva. The girl also is not your typical schoolgirl, somewhat strange in their own way.
If you liked
Saishuu Heiki Kanojo
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...then you might like
Ashita Dorobou
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Girlfriend is a superweapon, battles devastate the city, and a world full of surprises.
If you liked
"Bungaku Shoujo" to Shi ni Tagari no Pierrot
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Suugaku Girl
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Extraordinary girls that specialize in subjects (Literature and Math) that the story is based around. All with romantic undertones
If you liked
Watashi ni xx Shinasai!
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...then you might like
Ore no Kanojo to Osananajimi ga Shuraba sugiru
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Female Lead forces the male to do relationship like things for her own personal benefit.
If you liked
Ore no Kanojo to Osananajimi ga Shuraba sugiru
|
...then you might like
Nisekoi
|
Romantic Comedies with the main lead in a fake 'relationship' with a female lead, and the childhood friend is left behind
If you liked
Triage X
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...then you might like
Young Gun Carnaval
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High school student who is an assassin for a secret organization that hunts criminals.
If you liked
Kami nomi zo Shiru Sekai
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...then you might like
Warau Kanoko-sama
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Both characters are very good at being antisocial. Keima is the god of capturing 2D girls, and Warau Kanoko-sama is the master of observing others. They are very intelligent and accomplish multiple tasks in very different situations. Even though they are in basically completely opposite genres, each character cannot help but remind you of the other.