Prime Minister Yoshihiko Noda and his ruling Democratic Party of Japan-led government managed to submit the contentious bill to the Diet on Friday to double the consumption tax to 10 percent by 2015, while junior coalition partner Kokumin Shinto (People's New Party) was on the verge of collapsing over internal conflict on the legislation.

Given the green light by the Cabinet in the morning and submitted to the Diet later in the day, the bill is now ready to be deliberated on in the Lower House and the government is hoping it will be passed by the time the current Diet session ends in June.

But, as usual, there was no smooth sailing in the political world of Nagata-cho.