Kaiju No. 8, Volume 12 of 16 (by Naoya Matsumoto)

Kafka wants to clean up kaiju, but not literally! Will a sudden metamorphosis stand in the way of his dream?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?!The Eastern Division has been attacked by identified-class kaiju. Narumi and Kikoru have taken care of their targets, but Hoshina is still facing off against No. 12, the finished project that No. 10 served as the prototype for. Even worse, Numbers Weapon 10 won't output more than 83 percent unleashed combat power, making this battle even more of a struggle for Hoshina!