Chapter One - Day 1 in Captivity

Midoriya Izuku; boy-genius and aspiring hero; kidnapped by villains and forced to build weapons in their underground prison. On his own, he would have done as he was told, and waited to be rescued by pro-heroes. Unfortunately for the Villains, he wasn't on his own. They had also kidnapped a rather... eccentric... aspiring inventor.

Cover Art Not Mine