Kaiju No. 8, Band 1 by Taiyō Matsumoto

In a world where monstrous creatures known as kaiju frequently attack cities, the Defense Force is tasked with eliminating these threats. The story follows Kafka Hibino, a middle-aged man working in kaiju clean-up, who dreams of joining the Defense Force alongside his childhood friend, Mina Ashiro. However, Kafka's life takes an unexpected turn when he gains the ability to transform into a kaiju himself, earning him the nickname "Kaiju No. 8." As he grapples with his newfound powers, Kafka must navigate the challenges of hiding his secret while pursuing his dream of protecting humanity from the very monsters he can now become.

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