Kaijuu 8-gou is a Japanese manga series written and illustrated by Naoya Matsumoto. It follows the story of Kafka Hibino, a man who transforms into a kaiju, a monstrous creature, and aims to become part of the Defense Force to fight against other kaiju. The series blends intense action with comedic elements, exploring themes of ambition and transformation. It has gained popularity for its engaging storytelling and unique premise.