昔助けた最弱スライムが最強スライム...

Synopsis

"I never want to lose someone important to me again." One day, I, a nerdy and bullied boy, was provoked by my classmates to go to an SS-ranked dungeon. Facing an SS-class black dragon that I couldn't do anything about, my chances of survival were zero... At that moment, someone appeared before my eyes... This is the story of the bond between the strongest slime and the weakest me, as we grow together.