Kaiju No. 8 (Japanese Edition) by Naoya Matsumoto

In Japan, plagued by monsters called Kaiju, 32-year-old Kafka Hibino had given up his dream of joining the Defense Force until a parasite turns him into the powerful humanoid monster called Kaiju No. 8. Now Kafka must hide his monstrous secret, pass the Defense Force entrance exam, fight giant threats alongside his team, and somehow fulfill his promise to his childhood friend Mina--without getting dissected or executed as a monster. High-stakes action, hilarious transformations, heartfelt friendships, and epic battles make it a thrilling Series!