Vita hardware sales remain above the 3DS in Japan this week according to Media Create. But with the country having very much an off-week and little in the way of new releases (is there an annual "turn off that console day" in Japan?, there isn't much good news to shout about with Vita sales dipping below 20,000 for the first time in a couple of months.
The Vita is just below 18,000 while the 3DS slips below 15,000. Sword Art Online and the new BlazBlue are out tomorrow in Japan, so should provide a boost to the Vita's numbers next week. Expect the 3DS to do very well though, as Nintendo is running a free game offer with console sales.
The following week after that is Golden Week which sees a big sales boost for portable gadgets as lots of Japanese go travelling. After that summer hell commences and sales will struggle without a big name game to provide a lift.