One of the best Vita games you'll probably will enjoy (seeing your interest in Japanese games) is Soul Sacrifice. It really deserves double the sales it has right now. And with free DLC (whole new maps, missions and boss fights) still releasing you will have a lot of hours of fun.
Guacamelee is very good PSN platformer as well as Mutant Blobs (same developer). In a couple of weeks Killzone releases. Every preview about the SP said that it'll be one of the best Vita games. And the MP beta has only received good impressions.
Stories unfolded with my home made rap songs. Feel free to listen here with lyrics: https://youtu.be/vyT9PbK5_T0







