Most Quirks develop in people's younger years, the latest being around 4 or 5 years old. Anything beyond that and children can give up on possessing a Quirk of their own. Most people without Quirks are often ridiculed for being powerless as children. Most kids grow out of their hurt states. But what happens when one kid can't let go of the pain and harbours a deep rage? A rage so powerful, it denies death?
13 parts