"You... Were a mistake."
This is the first thing he hears after he is born.
As a parasite that failed in the experiment, it should have been destroyed, but it continued to expand in the human world through parasitism and evolution again and again.
It wasn't until a bullet penetrated its temple that it clearly saw its opponent in this era.
And the longest cat-and-mouse game in human history also begins.
Mission: There is still hope after destruction, never give up
