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I enjoyed these, but they all were around an 8 or 7 when I checked.
Also, please be aware of the tags! Some are horror/psychological/sexual
http://www.mangago.zone/read-manga/kojinsa_arimasu/
http://www.mangago.zone/read-manga/koroshiya_korosezu/
http://www.mangago.zone/read-manga/jun_and_kaoru/
http://www.mangago.zone/read-manga/henai_caf/
http://www.mangago.zone/read-manga/watching_tv_all_the_time_makes_you_stupid/
http://www.mangago.zone/read-manga/mud/
http://www.mangago.zone/read-manga/locker_room/

thank you :) <3