NIS America sent over some English screenshots of Disgaea 4: A Promise Unforgotten where the game's lead character Valvatorez promises to protect the Prinnies.
Nippon Ichi is continuing the story of Disgaea 4: A Promise Unforgotten with a able scenario starring Fuka and Desco. In Japan, you can buy the add-on as an append disc, which includes a special Desco figure.
Valvatorez, the lead character in Disgaea 4, used to be a Netherworld tyrant. See, he's a vampire that gave up drinking human blood. As a result, Valvatorez only has a sliver of his power and he's been reduced to a prinny teacher.
Whenever the PlayStation Store comes back online in Japan, Nippon Ichi will have a ton of able content ready for Disgaea 4: A Promise Unforgotten. Pleinair, Prism Red, and the Celestial Host are ready to be released as DLC.