Vita's going through an interesting time in Japan at the moment. God Eater 2 being the first "value" game to chart & Sword Art Online being boosted by the anime (should stick around for a while if Dangan Ronpa on PSP is anything to go by).
But Persona 4 is suddenly charting again too. And Famitsu shows it at 284k LTD. Looks like it's going to be the second Vita game to clear 300k in Japan, unless Freedom Wars beats it.