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idk if thats what youre looking for or if its underrated but i really liked it and it has an unique artstyle and story so i recommend it
http://www.mangago.zone/read-manga/bastard_hwang_youngchan/
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http://www.mangago.zone/read-manga/simplified_pervert_romance/
http://www.mangago.zone/read-manga/koishite_kissshite_kanjaitai/ http://www.mangago.zone/read-manga/
hetakuso_love_step/ http://www.mangago.zone/read-manga/sugar_dog_life/
http://www.mangago.zone/read-manga/my_lovely_bunny/
http://www.mangago.zone/read-manga/dekoboko_sugar_days/
http://www.mangago.zone/read-manga/takkun_to_stalker_danshi_kyou_wa_takkun_no_tissue_o_tabemashita/
i dont know if any of these will suit to your liking but these r def a good read for me oh n the genre is yaoi btw ( ̄∇ ̄")
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My bad i fucked up one of the links http://www.mangago.zone/read-manga/hetakuso_love_step/ there it is ლ(´ڡ`ლ)
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Hmm iam not sure about the underrated But if it a good story with unique plot.. I hope u enjoy reading this
http://www.mangago.zone/read-manga/spring_snow_pugum/
( this One is Really intresting )
http://www.mangago.zone/read-manga/he_is_a_high_school_girl/ ( this story is really funny)
http://www.mangago.zone/read-manga/secret_alliance/ ( Yandere cross dress as a girl to get close to his crush which i find it unique )
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http://www.mangago.zone/read-manga/this_witch_of_mine/ This is good but hella underrated
pls any recommendations idc about the genre just let it be underrated with a good af plot, or an unique one