Don't Tell Anyone, I'm Helping the United Nations Kill God

My name is Lin Yi, I am a freshman in high school and my grades are in the middle of the pack. Until that day, I was recruited by the United Nations secret organization - only three hundred people in the world, codenamed "Guardians". During the day, I went to class and took exams as usual, but late at night I stepped into a base three thousand meters underground, holding a weapon that could swallow the blood of gods, and hunted with my companions the ancient gods who were about to break through the seal. I thought I was a sharp blade of justice, until I discovered that all the mission files were stamped with the same blood-red seal: Top Secret - Target eliminated, no one survived. Hunter and prey, who is the real monster?