For further info/latest info you can look at their website, or ring +44-171-426-7330 or fax +44-171-607-7442 (from Europe/UK ) or ring 0171-607-7677 (from UK), and express an interest in subscribing. They should then send you the joining info and a 2-week programme leaflet in Japanese & English.
The subscription (payable in various currencies) costs £100 joining fee + £30 per month. So it costs more than the complete SKY package, there's only one channel, and you don't even get a subsidised receiver thrown in.