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these ones are kinda longer/have strong female leads:
http://www.mangago.zone/read-manga/back_to_the_highteen/
http://www.mangago.zone/read-manga/taming_a_tomboy/
http://www.mangago.zone/read-manga/koi_dano_ai_dano/
http://www.mangago.zone/read-manga/light_shadow/
http://www.mangago.zone/read-manga/gokusen/
these ones are funny/cute/chill:
http://www.mangago.zone/read-manga/seishun_otome_banchou/
http://www.mangago.zone/read-manga/kusumi_kun_kuuki_yometemasu_ka/
http://www.mangago.zone/read-manga/classi9/
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Straight romance, not necessarily shoujo but they’re good+female lead:
http://www.mangago.zone/read-manga/july_found_by_chance/?UyI6
http://www.mangago.zone/read-manga/our_relationship_is/?ygvV
One shot shoujo:
http://www.mangago.zone/read-manga/omae_watashi_no_koto_suki_daro/
The rest I highly recommend are unfortunately ongoing.
Can anybody recommend me some COMPLETED, GOOD shoujo romance mangas? I uses to love reading them then I switched to yaoi but now I'm craving for some.