An edit I made of a creature AU.
Where Denki and Sero are flightless bird-like animals that have been chained up for centuries, later to be found by class 1A and 1B. Then put in rehab with the class, to learn new things. They're the last of their kind sadly.
I will make more art of this AU when I have the time, but I might make this a new story once I'm done with the siren one.