Landslide, or Land-Divided?

A general election in Japan was held on August 30, 2009, for all 480 seats of the House of Representatives of Japan, the lower house of the Diet of Japan. In the election, the opposition Democratic Party of Japan (DPJ) defeated the ruling coalition (Liberal Democratic Party (LDP) and New Komeito Party).
The opposition DPJ-SDP-PNP coalition won 227 seats out of 300 (75.7%) in constituencies, and 91 out of 180 (64.3%) in proportional representation. That looks like a landslide victory over the ruling LDP-NKP coalition, who won 64 (21.3%), and 76 (42.2%) respectively.
Meanwhile, the ruling coalition won 36 seats out of 115 (31.3%) in constituencies in the Western Japan excluding Okinawa, and 32 out of 67 (47.8%) in proportional representation in the Western Japan including Okinawa. The opposition coalition won 76 (64.3%), and 31 (46.2%) respectively.
The question is whether Japan will be divided along regional lines in its future as in UK and USA.