Um

http://www.mangago.zone/read-manga/kosha_ura_no_natsu/
http://www.mangago.zone/read-manga/madk/

http://www.mangago.zone/home/mangalist/591398/

http://www.mangago.zone/read-manga/i_will_be_waiting_for_you_in_1999/
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http://www.mangago.zone/read-manga/10_years_where_i_loved_you_the_most/
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http://www.mangago.zone/read-manga/lonely_to_organdy/
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Those are a few sad ones that will probably hurt your heart,Enjoy!^^

http://www.mangago.zone/read-manga/smells_like_green_spirit/

horror bl
http://www.mangago.zone/read-manga/black_mirror/

http://www.mangago.zone/read-manga/sensei_kowai_hanashi_shimasenka/

http://www.mangago.zone/read-manga/samenai_yume/

http://www.mangago.zone/read-manga/stigmata_aikon/

http://www.mangago.zone/read-manga/the_beautiful_ones/

http://www.mangago.zone/read-manga/interview_with_a_murderer/

http://www.mangago.zone/read-manga/itou_san_kuraka_sui/

http://www.mangago.zone/read-manga/replicant_hitsuji_no_dolly_wo_aisuru_to_iu_koto/

The ones at the top are the most like genuine horror but all of them carry an eerie or at least serious tone throughout the story.

Thank you all so so so so much ٩(๑❛ᴗ❛๑)۶