Idk if it counts as cozy but “Hundred ghost stories of my own death” is one I’ve been following for a while now
https://www.mangago.zone/read-manga/kansai_jin_to_hukuman_satsujinki/
Not really cozy but it is funny horror related manga
https://www.mangago.zone/read-manga/ura_baito_toubou_kinshi/
https://www.mangago.zone/read-manga/fuan_no_tane/
https://www.mangago.zone/read-manga/pure_trance/
https://www.mangago.zone/read-manga/you_will_hear_the_voice_of_the_dead/
https://www.mangago.zone/read-manga/andy/
https://www.mangago.zone/read-manga/love_practice/
https://www.mangago.zone/read-manga/doku_doku_mori_mori/
https://www.mangago.zone/read-manga/dark_gathering/
Some of these are TOO spooky!!!
Any cozy horror recs? Gotta start my October right