With the highest rate of kaiju-emergence in the world, Japan frequently faces deadly monster attacks, which the Japan Defense Force works tirelessly to neutralize. For Kafka Hibino, who is tasked with cleaning up the remains of these creatures, joining the force has always been a lifelong aspiration. But as he unexpectedly undergoes a metamorphosis, he finds himself grappling with a difficult quandary - how can he fight against kaiju when he has become one himself?