Project Atom Boi follows the story of Yuanzi (Xiaonan Wang), a doomer who, pressured by a self-indulgent Filmmaker (Francesca Marcolina), starts re-exploring the memories of her childhood in China. Yuanzi grew up in Factory 404, a Cold War ghost town in the Gansu province that was built in the fifties with the sole purpose of hosting a nuclear weapon. As Yuanzi travels back in time, we also meet her childhood best friend Erdan and her grandfather (both played by Kelvin Chan).