10 years ago Izuku was lost. 10 years ago villains attacked U.A. during the Graduation ceremony. 10 years ago, Izuku was lost to a villain's quirk. 10 years ago, class 1-A was saved from the unknown… but Izuku paid the price for their well-being… In the present, his high-school friends will reunite with their lost comrade, who has been off fighting the Covenant.

After The activation of instillation-04-b, the Gravemind uses it's precursor knowledge, and forerunner tech to open a slip-space portal. I its attempt to save its self, it accidentally transports its self into the world of my hero academia. but this humanity will not be tested, so the Gravemind decides to try and walk among this odd version of humanity, for its own amusement...