There was a Japanese news article about this a couple of months ago. It talked about the relationship between Utada and IDJ, and that was when they first announced IDJ had nothing to do with this tour. Her and the team wanted to do it, but IDJ didn't feel any money would come out of it. As to not make it such a big deal, that is why Hikaru set up the small amounts of shows across the country in small venues, with so little promotion, as to not get into any more trouble with IDJ. Of course, they found out after wards, and said they were "tired of dealing with Hikaru Utada, whose team does things without asking and not going through the label."

If I find the article, I'll post it up.