Responses
omniscient reader's viewpoint
solo leveling
yuukoku no moriarty
d gray man (i think? its shounen)
phantom seer
white blood (tagged romance but there has been zero romance still)
jujutsu kaisen
sweet home (horror, but still pretty tense)
http://www.mangago.me/home/mangalist/933944/
@yumiko has a great list: http://www.mangago.me/home/mangalist/626481/
Please Suggest me some good action without any romance!