In a Kaiju-filled Japan, Kafka Hibino is a regular guy working in monster disposal who aspires to join the ranks of the Defense Force alongside his childhood friend and rising star Mina Ashiro. After reuniting with Mina, Kafka decides to pursue his abandoned dream…when suddenly he is transformed into the powerful “Kaiju No. 8.” With the help of junior colleague Reno Ichikawa, Kafka hides his identity to chase his life-long dream of passing the Defense Force exam, until one day when a mysterious intelligent Kaiju attack a Defense Force facility and forces him to make a life-altering decision that will test his identity.