trends in Japan

I think that trends in Japan is Japanese idol group, ARASHI.
I'm not fan of ARASHI,but almost of my friends like it.
It appears on television every day.
For example, TV drama,variety, and news.
Its activity is various.
Also, its CDs are selling well.
Although CDs are not selling very much in Japan, ARASHI's CD are selling.
I think that ARASHI is popular among every generation.
So I think ARASHI is trends in Japan.