Natsume will localize End of Serenity, KEMCO's classicly-styled JRPG, sometime this summer on the PlayStation Network. Hold off on adding another RPG to your Vita's schedule though - End of Serenity is planned to go back a generation and land on the PSP.
End of Serenity's world is littered with objects called Atomigems, which are used for everything from family heirlooms to items of elevated status worthy of worship. A group known as the Underworld has begun hoarding Atomigems for itself however, regardless of the importance placed in each item by previous owners.
Although the PSP version is End of Serenity's first North American appearance on handhelds, IGN noticed that the RPG began on mobile platforms as End of Aspiration. If you're okay with trading physical buttons for the chance to explore KEMCO's RPG right now, that version is currently available in the North American Google Play store for $4.99.
There's a chance you've played Natsume's last mobile-to-PSP JRPG port, too - the publisher also brought KEMCO's Mystic Chronicles to the PSP last year.