Mitsuru Akai just moved from the countryside to the city with her father, Fuma—a man who once made a name for himself as a legendary Monster Killer. On her very first day at the new school, she’s targeted by the local bully and dragged to a warehouse to be taught a lesson. But the bullying turns into a bloodbath when a swarm of monsters suddenly appears. Even stranger? It seems Mitsuru is the only one who can see them. Before she can make sense of it, she’s abducted by two shady men posing as police officers. Now, a father’s rage has been ignited. Fuma vows to get his daughter back at any cost, and the world’s strongest father is about to show the city's worst monsters exactly why they should be afraid.