Is there any recommendations for manga (not manhwa) with a really well-written story and a...

The only two I can think of are:
Hikaru ga Shinda Natsu (Honorary mention, vaguely “romancy” psudo BL, it’s just super interesting, they’re making an anime adaption this summer)
Hotaru no yomeiri (straight, ongoing, “forbidden/doomed” love)

No smut but definite mentions of sex and implied desires. I mostly read Manhwa, mainly a ton of medieval fantasy romance (usually regressions or transmigrations

These are all my faves (≧∀≦)
https://www.mangago.zone/read-manga/rumspringa_no_joukei/
https://www.mangago.zone/read-manga/dear_gene/
https://www.mangago.zone/read-manga/link_and_ring/
https://www.mangago.zone/read-manga/family_now_and_forever/
https://www.mangago.zone/read-manga/sekai_de_ichiban_toui_koi/
https://www.mangago.zone/read-manga/haru_to_natsu_to_nacchan_to_aki_to_fuyu_to_boku/
https://www.mangago.zone/read-manga/chameleon_wa_tenohira_ni_koi_wo_suru/
https://www.mangago.zone/read-manga/shinyuu_no_dousei_shite_ni_un_to_iu_made/
https://www.mangago.zone/read-manga/ao_to_midori/
https://www.mangago.zone/read-manga/chiguhagu_na_kiss/
https://www.mangago.zone/read-manga/loss_time_ni_hanamuke_o/
https://www.mangago.zone/read-manga/snow_fairy/
https://www.mangago.zone/read-manga/konosaki_wa_futarikiride/
https://www.mangago.zone/read-manga/old_fashioned_cupcake/
https://www.mangago.zone/read-manga/living_with_him/
https://www.mangago.zone/read-manga/delivery_hug_therapy/
https://www.mangago.zone/read-manga/hidamari_no_orange/
https://www.mangago.zone/read-manga/awairo_emaki/
https://www.mangago.zone/read-manga/kimi_to_nara_koi_wo_shite_mite_mo/
https://www.mangago.zone/read-manga/hayama_sensei_no_dakimakura/
https://www.mangago.zone/read-manga/motoyan_papa_to_hitsuji_sensei_yotsuba/
https://www.mangago.zone/read-manga/ugetsudou_antique/
https://www.mangago.zone/read-manga/itooshiki_hibi/
https://www.mangago.zone/read-manga/toumei_na_ai_no_utsuwa/
https://www.mangago.zone/read-manga/amagami_wo_kimi_ni/
https://www.mangago.zone/read-manga/the_omega_takes_a_husband/
https://www.mangago.zone/read-manga/ookami_sama_no_koiwazurai/
https://www.mangago.zone/read-manga/mitsuya_sensei_no_keikakuteki_na_edzuke/
https://www.mangago.zone/read-manga/shiawase_gohan_maki_to_hanazawa/
https://www.mangago.zone/read-manga/enishi_majiwaru_haguremono/
https://www.mangago.zone/read-manga/muchuu_ni_naruu_yo/
https://www.mangago.zone/read-manga/country_diary/
https://www.mangago.zone/read-manga/tabun_korekara_ai_no_hibi/

Oh I didn’t see no bl smut here are Shounen Ai bls
https://www.mangago.zone/read-manga/saiyaku_wa_boku_o_suki_sugiru/
https://www.mangago.zone/read-manga/sankaku_mado_no_sotogawa_wa_yoru/
https://www.mangago.zone/read-manga/harenochi_shikibu/
https://www.mangago.zone/read-manga/iki_dekinai_no_wa_kimi_no_sei/
https://www.mangago.zone/read-manga/hiyoko_to_yoru_to_yuenchi/
https://www.mangago.zone/read-manga/kawa_ni_sazanami/
https://www.mangago.zone/read-manga/tonari_no_ren_kun_wa_chotto_kowai/
https://www.mangago.zone/read-manga/minato_shoji_koinrandori/
https://www.mangago.zone/read-manga/mitsuya_sensei_no_keikakuteki_na_edzuke/
https://www.mangago.zone/read-manga/shiawase_gohan_maki_to_hanazawa/
https://www.mangago.zone/read-manga/country_diary/
https://www.mangago.zone/read-manga/haru_to_natsu_to_nacchan_to_aki_to_fuyu_to_boku/
https://www.mangago.zone/read-manga/koibito_ga_ubu_sugite_komaru/
https://www.mangago.zone/read-manga/inoue_kun_hajimemasen_ka/
https://www.mangago.zone/read-manga/one_week_family/
https://www.mangago.zone/read-manga/yuutousei_wa_unmei_no_akai_ito_ni_sakaraitai/
https://www.mangago.zone/read-manga/delivery_hug_therapy/
https://www.mangago.zone/read-manga/kimini_furu_kotonoha_ha/
https://www.mangago.zone/read-manga/internet_love/
https://www.mangago.zone/read-manga/the_boy_and_the_wolf/
https://www.mangago.zone/read-manga/senshun_kansoku/
https://www.mangago.zone/read-manga/fudanshi_kazoku/
https://www.mangago.zone/read-manga/lionhearts/
https://www.mangago.zone/read-manga/hime_muko/
https://www.mangago.zone/read-manga/sugar_glazed_darling/

Hehehe tysm!! I've read soooo much yaoi during quarantine that I'm trying to read other things that's why I said yaoi not preferred but I'll still read it hahaha.

yeah the regression and transmigration fantasy romance was literally all I used to read. I think I was binging a bunch for a year and just got bored and tired of them. I kinda like them more in manga format but if you have some REALLY good ones then send them my way :D