TRIGGER (2022) is a Manga/Manhwa/Manhua in english language, ACTION series, english chapters have been translated and you can read them here. You are reading chapters on www.mgeko.cc fastest updating comic site. The Summary is

Once upon a time, there was a girl who had no father and no mother. She became an expert with a pistol. She even went to war. She was given the name TRIGGER. Now, this girl… Why did she kill so many people in the war that took her parents away?