Taming the Beast: Do You Want Me to Save the World at the Beginning of the Game?

[Beast Control + Academy + System + Picture Book] Six hundred years ago, living things were deformed, dead things were alienated, and corpses and beasts everywhere tore up the old order. The entire ecology was reconstructed in this great change. Talking crows and winged mushrooms streak across the sky Jellyfish with dancing tentacles floating in the clouds Insects made of soil writhe in the wilderness The animals transformed from chariots trample the earth with iron hooves. As soon as Li Yuanda traveled to this wonderful and strange world, he took the place of an unlucky guy who contracted a black crow on the street. There is also an inexplicable "salvation system" on his body. I don't even know why you want to save the world, so let me ask you, is it appropriate to ask me to save the world in this kind of start? With an unexpected second life, what choice will he make in this unknown land?