It happened quite suddenly, with no warning - all the memories of all the people on Earth, swept away as if by a sudden wind. In a post-catastrophic Earth populated mostly by savages without memories of their past civilisation, one man travels on a journey of enlightenment and hope, across a devastated America.
Kaze no Na wa Amnesia, A Wind Named Amnesia, Kaze no Na wa Amnesia, Kaze no Namae wa Amunejia, The Name of the Wind is Amnesia
R - Mild Nudity
A Wind Named Amnesia