When people make a certain decision, they often don't realize how many chain reactions it will cause. The country that initially started the war simply wanted to seize the resources of its neighboring country, using the excuse of "someone deliberately releasing Cannibalistic Evolvers into our country" to start the war. However, starting a war is easy, but they didn't expect that after being surrounded on all sides, the neighboring country would retaliate in desperation, using Cannibalistic Evolvers to attack the warring country's army and injecting Evolver's Blood into their important figures.
Not everyone who begins to evolve will succeed, especially artificially created Evolvers, who may die from illness or devolve into Aliens.
