Prologue-Runaways

What if Nagisa had ran away from his abusive mother? What if Kayano hadn't been able to endure the loss of her sister? What if they both met in the streets? What if the God Of Death had taken them under his wing? A What If AU, where Koro-Sensei is still the God Of Death and Aguri died in a car accident. Nagikae. Rated T for blood, gore and cursing.