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To play the Japanese version (JPN) on a modified PS Vita with English text, you typically use the and rePatch plugins.
For purists and fans of the original vision, the JPN version is the only acceptable way to play. However, this creates a problem for PS Vita archivists: the game is region-locked in the sense of DLC and updates, and the physical cartridges are becoming expensive.
The keyword "omega labyrinth z ps vita jpn nonpdrm upd" represents a specific, technical intersection of gaming preservation, regional censorship, and homebrew software. For the Vita enthusiast, mastering the installation of this particular title serves as a perfect test case for understanding how NoNpDrm, patch directories, and Title IDs work.