aka A Wind Named Amnesia (1993)
Dir. Kazuo Yamazaki
A peculiar wind blows across the world, erasing mankind's memories. It's like nature hit a reset switch: people forget how to speak; parents forget their children, and vice versa; drivers forget how to drive; doctors forget how to heal, etc. The knowledge in books remains, but no one knows how to read. With even basic life skills lost, how will humanity survive? And more to the point, do they even deserve to?
But like every post-apocalyptic scenario in fiction, not everyone is affected. A memory-wiped youth named Wataru meets one such individual and learns from him. Thereafter, Wataru journeys across America looking for something that honours his mentor / friend.
I'm a big fan of stories that encourage us to question what makes cultures tick, and by extension examine humanity's true worth. E.g., with a clean slate, can we do things better? With religion dead, will our unconscious fears cause us to invent it again? Post-apoc settings are a tremendous framework for that kind of thing.



