One day at school, the class teacher turns into a "huge spherical insect beetle" and kills half the students. The Black Ant that appeared at that moment, which was able to save the rest of the students, becomes the main object of attention of the media and social networks, and its existence is no longer a mere legend of the level of urban ghost stories. Eventually the government decides to infiltrate a team of Bug Reapers, insector-catchers on a secret mission and, according to survivors, on the heels of the Black Ant. Black Ant's personality is an ordinary high school student, Ka Mi-sun, who has an anthill in his body. So that the insects living in it do not eat it, the guy has to become an enemy of the insects and reluctantly fight.