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This one is super cute.
http://www.mangago.zone/read-manga/samishigariya_no_love_letter/
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http://www.mangago.zone/read-manga/number_call/ Is super sweet and light.
http://www.mangago.zone/read-manga/blue_sky_complex/ is popular but it's worth the honorable mention. (:
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i collect the ones i like in my list
http://www.mangago.zone/home/mangalist/8384/
maybe you`ll find some new ones...
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I can suggest some other but u probably read them lol
http://www.mangago.zone/read-manga/slow_starter_ichikawa_kei/
http://www.mangago.zone/read-manga/seven_days/
http://www.mangago.zone/read-manga/itsuka_tomodachi_ja_nakunaru_to_shite_mo/
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Also this one got no sex at all, it's fun as well
http://www.mangago.zone/read-manga/crush_on_you/
Preferably along these lines...school life, not too much sex, just something sweet and nice with pretty art and something that isn't that popular since I have read A LOT of yaoi. A good story and young love???