The Star Devouring Era

In the future, after a great cataclysm, a new ecosystem emerges on Earth. Just as humanity thinks it can rebuild civilization in an orderly fashion, people discover that every living thing, humans included, has evolved. These creatures keep encroaching on humanity’s living space, shrinking it further and further. Can humanity survive this calamity? Will we, accustomed to ruling everything, remain masters of this world? How will the protagonist rise above the endless conflict and turmoil?