Maybe it's the No Longer Human manga adaptation by Junji Ito? There are many uploads and I haven't read it so idk which one is the 'right' one or if they're all the same, but here are the links:
http://www.mangago.me/read-manga/ningen_shikkaku_itou_junji/
http://www.mangago.me/read-manga/ningen_shikkaku/
http://www.mangago.me/read-manga/ningen_shikkaku/
Sorry, the third link is the same as the second, here is the correct link: http://www.mangago.me/read-manga/ningen_shikkaku_furuya_usamaru/
Im trying to find this depressing manga where he lived in Japan somewhere in 1800s-1900s i dont remember but people wore kimonos. Anyways the only thing that i remembered was that he killed women? Or like he dindt die with the women by drowning in the sea together. Alot of woman were following him ( which were shadows ) and giving him guilt by something he had done.
I remembered the manga by hearing one of Osamu Dazais work no longer human and hearing him commit suicide with a woman in the sea but failing afterwards made me remember this depressing manga. Please help me! Thank you so much.
Im gonna have to look in my already red lists too. I also feel like since junji ito kind of worked with the novel too? I dont know if it was a novel.. im gonna look at his manga works too.