Looks like Idea Factory is really embracing the production of PS4 themes, and today they released the fourth one dedicated to HyperDimension Neptunia Victory II on the Japanese PSN.
The theme, that you can find here, costs 280 yen ($2.35).
As usual, remember that you have to use a Japanese account or an incognito window to see the link above, or at least to log out of your western account. You can find a handy guide on how to create a Japanese PSN account here.
If you want to see how it looks, you can check out two screenshots above and below.