The Japanese playstation site shows "ps vita" and "ps vita tv" next to Ys, so I think that means it's compatible..... but maybe not..... I can't read them chicken scratches.
Alright, did myself some Googlin', found this off Gamefaqs, he doesn't state his source, but I know I didn't read it at Gamefaqs originally:
As of right now, 12/05/2013, the NTSC version of Ys: Memories of Celceta is NOT compatible with an imported Vita TV. The Japanese version of the game is, just not our English version, and likely won't until an American release of the Vita TV.