Sonaria. A plane of existence with creatures as large as sky scrapers. It was wonderful. Beautiful. And then there's earth. Humans roam with being the main predators. Not for long. When the worlds merged humans were suddenly on the bottom of the food chain. Some humans mutated to have more creature like appendages. Humans and some creatures started to cross breed.

UA. The prestigious hero school that only so many get into. It had expanded to accommodate the new creature-human cross breeds. Class 1-A was thinking about what types of students they would start seeing. Some were talking about that fact. "Do you think we'll get cool students here?" Mina says to Ochako. "I hope so! Maybe even befriend a few!"