My 2015 kicked off with a January concert by Hatsune Miku, Japan's digital pop star, in Las Vegas. It is winding down with a visit to Miku's creator, Hiroyuki Itoh, at his company's head office in Sapporo, Hokkaido.

I've long learned to temper my skepticism toward Japan's cultural presence in the United States. As a half-Japanese American kid, I never thought I'd see sushi in supermarket aisles, manga in malls, or Pikachu and Hello Kitty balloons soaring over Manhattan in the annual Macy's Thanksgiving Day Parade, as they did again last month in that distinctly American matsuri (festival).

I also never imagined that a Japanese virtual singer (Miku) would be the featured musical act on an iconic American TV talk show ("Late Show with David Letterman" in 2014).