The last we heard of Natural Doctrine, the game was originally set for release on February 22nd in Japan. Unfortunately, the game is being pushed back to March 19th.
This confirmation comes via the latest issue of Dengeki Playstation, and a reason for the delay in development was not given. You can read more about the game in our initial coverage here.
The game is getting a combo pack between Playstation 4 and Vita for 7,980 yen.