As reported earlier this week, Disgaea 4: A Promise Unforgotten will get two sets of downloadable chapters.
The Tyrant Valvatorez, shows a "new" side of the Disgaea 4 protagonist. You’ll get to see a new side of Valvatorez and his true power. This scenario will be released on August 31 for 600 yen ($7.50) in Japan. Tyrant Valvatorez is a new character and Dengeki PlayStation hints you may get to use him after you clear this scenario.
A four episode scenario starring Fuka and Desco will be released later this year. Fuka & Desco chapter will be released on the PlayStation Store for 2,000 yen ($25). Nippon Ichi will also sell the Fuka & Desco chapter on an append disc (this requires the original disc), which includes a maxi single soundtrack and Desco figure for 4,179 yen ($52). A PlayStation 3 package with Disgaea 4 and the Fuka & Desco scenario will also be available for 6,090 yen ($75).
The center of this scenario is sisterly love. Fuka is said to act as the big sister and Desco is a spoiled baby sister.