The Birko Laboratory was established in a nature reserve in Eagle Country in 2013. The laboratory mainly studies the impact of some catalysts on organisms. In 2020, Birko's laboratory synthesized a drug called "NLN" that can catalyze the division of biological cells. The laboratory also won awards for this. In 2022, this agent will be widely used in agriculture and animal husbandry. In 2025, Eagle Country's agricultural and animal husbandry output value will account for 40% of the world's total. In 2030, due to an accident, a large amount of deteriorated "NLN" was leaked into the river, and the surrounding animals were affected and mutated one after another. The Eagle Country government organized a cleanup, but it soon ended in failure. Mutated animals reproduced at an extremely fast speed and attacked power stations, hospitals, military camps, and ports. The Eagle Nation was soon paralyzed by economic failure. In 2033, mutated beasts appeared all over the world for some unknown reason except Eagle. At the same time, with the revival of Britain, France and Germany, NATO was disbanded and Germany replaced the Eagle Country as one of the new five permanent members. Scientists developed bullets that could restrain mutant beasts, and then the world formed beast-suppressing forces to go around the world to eliminate mutant beasts.
Intention: the evil and good in human heart