With the highest kaiju-emergence rates in the world, Japan is no stranger to attack by deadly monsters. Enter the Japan Defense Force, a military organization tasked with the neutralization of kaiju. Kafka Hibino, a kaiju-corpse cleanup man, has always dreamed of joining the force. But when he gets another shot at achieving his childhood dream, he undergoes an unexpected transformation. How can he fight kaiju now that he's become one himself?!

Fulfilling his childhood promise, Kafka moves to neutralize Kaiju No. 9 by Mina Ashiro's side. Amid an extreme back-and-forth battle, No. 8's berserk mode cracks No. 9's shield and pierces the core, but it turns out that's not the source of No. 9's power!