It's nice to see both Engine Summer and In Watermelon Sugar on this list. If you like mellow postapocalpyse, check out Hitoshi Ashinano's manga Yokohama Kaidashi Kikou.
Hmm. Just thinking about west meeting east... Hiroshima Mon Amour is, in many ways, a cyberpunk work in the way the concept of memory as a first-class character with its own life is in clear display.