Marvelous AQL seems to be having a successful run with the PlayStation Vita. Soul Sacrifice, Senran Kagura: Shinovi Versus, and the vivid port of Muramasa: The Demon Blade have all sold fairly well in Japan.
Muramasa Rebirth broke past 100,000 units sold. This figure includes shipments* of the packaged game and PSN purchases for the digital release. Not bad considering the game is only a month old. Looking back, the Wii version was "in the ball park of 35K" according to the NPD with a little less than month’s worth of sales in North America.
Muramasa Rebirth comes out on June 25 with a new localization from Aksys.
*As a clarification to an earlier version of this post, the figures for the packaged version are shipments.