The "Prime Minister of Japan and His Cabinet" website did the site renovation and added some new features to its English and Chinese sites to appeal Japan's recovery and a special site just for kids, for 120 million yen (US$1.5 million). That's without the maintenance fee.
Who got to do this project? A company called Internet Initiative Japan (IIJ), 30% owned by the telecom giant NTT. It got the contract without bidding because "there was no viable competitor".
(For more, see here and here. Sorry they are both in Japanese.)
Front page, now with extremely small fonts:
"Kantei" (PM's Office) for Kids, where kids get to play games to learn all about the administration does:
"Let's study social science", "Get to know more about Prime Minister", "Virtual Prime Minister's Official Residence!", "Get to know more about what the administration is doing!"
If you go to "Kantei for Kids" site by the way, you will notice there is no link back to the original (adult-version) "Kantei".