I Am Setsuna was recently announced to be coming west this summer with an exception: the PS Vita version would remain a Japan exclusive.
If you’re a disappointed Vita owner, there might be hope just yet. In a interview with US Gamer, I Am Setsuna director Atsushi Hashimoto went on record and said if there is a large enough demand, that they will consider bringing over the Vita version as well.
From the interview:
Of course, there is a large Vita market in Japan. If there is a swell of demand in North America [for the Vita version], though, we will consider it.
I Am Setsuna will be launching this summer for the PS4 and PC.