You can find a wide spectrum of political views among Japanese mangas - from the nutty uber-Chomskyite Left to palro-Tojoite militarist Right. To be honest, the fads come and go in Japan and I would doubt whether most run of the mills Japanese, whether they are leftists or conservatives, will take such mangas seriously.
The article raises an important point about Japan vis-a-vis the rest of East Asia: Japan has always enjoyed a recent cultural link with the wider Anglosphere but it also occupies a place in the Chinese cultural sphere (Sinosphere) when considering its heritage. The conflicts between Japan going into the Anglosphere's orbits (as manifested by Yukichi Fukuzawa's Datsu-A Ron, or "Leaving Asia" theory), and uniting with the rest of the Chinese cultural sphere (as put forth in the ideology of pan-Asianism, or "Asian united front" theory) is particularly intense. It may be an interesting battle ahead.
For a view favouring Japan aligning with the Anglosphere, see this Jim Bennett, a US conservative and Anglosphere adovate, article:
http://www.upi.com/inc/view.php?StoryID=18012002-055550-1094r
For a view adovating Japan to embrace pan-Asianism, see this article by Chen Kwang-hsing, a Taiwanese Marxist/Third World nationalist leftist (in Chinese):
http://hss.nthu.edu.tw/~apcs/kh/04.htm
Thanks for the links.