Tenko Shimura had been abandoned and left on the streets when he was 4 years old. A man named Shie Hassaikai had taken pity on him, although it wasn't a fairly good life as he had been renamed Tomura Shigaraki. He is being experimented on too make bullets that with one shot can make you turn into ashes. He and his foster brother Kai Chisaki go to UA since they need control over they're powers and more ad then is when Shigaraki starts to see potential and meaning in life, as he gains friends and a lover.