The Miyoshi brothers have powerful regenerative capabilities.  They say that taking life is offering salvation, and in them Shungiku sees his own younger self.  Oooka, who knows the old Shungiku, is doubtful he can win the battle.
We are the hardest to kill of all insects.
Somos los insectos más difíciles de matar.
Somos los insectos 
más difíciles de matar.
Nós somos o inseto mais 
difícil de matar.