https://www.mangago.zone/read-manga/kiyoku_yamashiku_modokashiku/
https://www.mangago.zone/read-manga/ohayou_ibarahime/
https://www.mangago.zone/read-manga/immortal_rain/
https://www.mangago.zone/read-manga/tsuka_no_ma_no_ichika/
https://www.mangago.zone/read-manga/boku_no_gemini/
https://www.mangago.zone/read-manga/natsuaki_kun_wa_kyou_mo_kokuhaku_shitai/
https://www.mangago.zone/read-manga/primitive_boyfriend/
https://www.mangago.zone/read-manga/madame_petit/
https://www.mangago.zone/read-manga/kujira_no_kora_wa_sajou_ni_utau/
https://www.mangago.zone/read-manga/kawaii_hito_saitou_ken/
https://www.mangago.zone/read-manga/hosaka_sensei_no_ai_no_muchi/
https://www.mangago.zone/read-manga/kijima_san_to_yamada_san/
https://www.mangago.zone/read-manga/futarijime_romantic/
Have you tried any of these?
please recommend me some completed straight romance manga (the unpopular ones)