Here's a pretty interesting artcile I came across about a book titled "AKB 48 and the Black Companies (AKB48と日本のブラック企業)". I think most of us are already pretty disgusted by Japan's idol culture, but after reading this, you might walk away slightly more appalled than before.
here:
http://jakeadelstein.wordpress.com/2014/07/31/akb48-a-microcosm-of-dark-corporate-japan-sexual-exploitation-of-child-labor-is-sooo-cute-a-book-review-and-polemic/