Oi the stream is over, it was 1 hour long and awesome.
It was probably one of the best I've watched so far. Although the Chisato Momoko one was cool because it was outside and all and here they sat all the time in a room but it was super fun because it was very interactive. They did read and react to comments (aka some kind of chat messages) very often and involved the viewers with having some opinion polls and quizzes. Two people even won a ticket for the stage play it seems.
The host was also very informal so Berryz had a lot of fun.
Only negative point for me is that Momoko was missing (and Miyabi). They were probably doing stuff for Buono. It was so awesome they saw all the comments about Momo and so they said they are busy with work (I think ?).
Some pics the manager posted on twitter:
http://twitpic.com/2do5urhttp://twitpic.com/2do4i9http://twitpic.com/2do2yyHopefully there'll be a rip but it won't be as awesome since the comments will be missing (unless someone did a good screen capture)