stylocoolio18

The Guy upstairs
Killing stalking(kinda with "romance"(more obsession than romance))

https://www.mangago.me/read-manga/kaya_chan_wa_kowakunai/

https://www.mangago.me/read-manga/gift_plus_minus/

https://www.mangago.me/read-manga/by_the_tama_river/

https://www.mangago.me/home/mangatopic/14127434/

https://www.mangago.me/read-manga/the_farthest_friend/

https://www.mangago.me/read-manga/crueler_than_dead/

https://www.mangago.me/read-manga/i_will_die_soon/

https://www.mangago.me/read-manga/kill_me_now/
Even though it's gl but still cool

It's actually quite popular but "Chi no Wadachi" by oshimi shuzo is very good, I'd also recommend all of his manga, but a lot of them have romance sub plots, but it's handled well and with a psychological/manipulative touch

and you may also like
-miss guillotine
-misu misou
-Alice in Borderland(has a show on netflix but the manga is unpopular)
-Tomie
-Takopi's Original Sin
-An Uncomfortable Truth

but If you're still interested in the other oshimi shuzo works with romance then read,
-Aku no Hana
-Inside Mari
-Happiness
-Welcome Back, Alice

https://www.mangago.me/read-manga/stigmata_seikon_sousa/
ignore the tags. it is NOT yaoi or romance. gore, psychological. it is SO good

Here go through this list -
https://www.mangago.me/home/mangalist/366645/

https://www.mangago.me/home/mangalist/2555901/

https://www.mangago.me/home/mangalist/1031841/

ive read killing stalking. but the other one not yet. thanks for rec(づ￣ ³￣)づ

thnaks for recsヾ(☆▽☆). will read one by one

gl also cool thanks (▰˘◡˘▰)

wow thanks. so many recs. look good (≧∀≦)

woww high praise. definitely will read this asap. thanks for the rec(๑•ㅂ•)و✧

thank youuuuuლ(´ڡ`ლ)

i will check it out. thanks for the recs

Sorry I send wrong link insta of this
https://www.mangago.me/read-manga/brutal_satsujin_kansatsukan_no_kokuhaku/

https://www.mangago.me/read-manga/hwang_young_s_misery/