[Corvina]

Here's the documentary:
http://www.dailymotion.com/relevance...k-part-1_music
http://www.dailymotion.com/relevance...k-part-2_music
http://www.dailymotion.com/relevance...k-part-3_music
http://www.dailymotion.com/relevance...k-part-4_music
http://www.dailymotion.com/relevance...k-part-5_music

It's like a movie and tells everything you have to know about Kumi becoming successfull. There's a lot of talk, but the documentary itself is understandable without knowing japanese.
But I try to find the english summary now!

And yes, the host of this show is Nakai from SMAP, her current boyfriend.