The narrative begins at the USJ facility, where Class 1-A's training exercise has been ambushed by the League of Villains. Shigaraki, Kurogiri, and a monstrous Nomu have overwhelmed both Aizawa and Deku. In a moment of desperation, Momo attempts to use her Creation quirk to help, but it goes awry. Instead of an object, she creates Guest , her first living, human-shaped creation. Guest materializes in the middle of this intense battle, met with astonishment from classmates like Bakugo and Mina, and curiosity from the villains. Momo is left completely drained by the effort, and Guest purpose and abilities are unknown as they face down the Nomu. Guest was in the hero textbooks about how they was experimented on and tortured, and they died in a tragic way. Guest was dead for 2 years before Momo accidentally created them because Momo was under so much pressure during the fight and accidentally created Guest back from the dead. Now Guest is up against the nomu. Guest was in a textbook, the heroes had to learn about the textbook so they can stop future things like what happened to Guest. Guest was a powerful experiment that had to be killed by the scientists that experimented on Guest. Everyone read that textbook, even the villains.