The world has forgotten that Peter Parker exists in Spider-Man: Brand New Day.
This condition results from Doctor Strange’s spell at the end of Spider-Man: No Way Home. The spell is designed to remove knowledge of Peter Parker from everyone, including people who previously knew his secret identity. Peter remains alive, but his relationships and social history are effectively erased from other people’s memories.
The distinction between forgetting Peter Parker and forgetting Spider-Man is important. The spell targets Peter’s civilian identity and the knowledge connecting him to Spider-Man. Brand New Day explores the consequences of Peter continuing to act as Spider-Man without the personal support network he once had.
Peter Parker is not the same character as Doctor Strange, whose magic creates the reset, or Spider-Man, the superhero identity Peter continues to use.