The new PV is on YouTube (h/t Beveridge) and includes new footage (with spoilers). It is not officially numbered, but I consider it 2nd after the first one that was suddenly named a PV a month after its release.

Shiburin, apparently, wears a certain necklace at all times, even with a tie! Its pendant must contain her charisma powers. At this point I'm considering hibernating until 2015.

UPDATE: From the ANN article:

As of 2012, the game earns approximately 1 billion yen (about US$9.6 million) each month, and has over four million users. The game has inspired a line of goods, various manga adaptations, and the 25th through 30th CD character song singles will be released later this month.

Interesting. I already observed that the game seems like making money, but this puts an (obsolete) number on the amount.