Dengeki PlayStation reports their first collaborative title is Generation of Chaos VI and it’s coming to PSP on June 28. Details about the game haven’t leaked online yet. NIS America brought Generation of Chaos to North America, which is actually Generation of Chaos IV.
Update: Generation of Chaos VI has a one on one battle system with timing elements. Hit buttons at the right time and you can do a cooperative chaos attack. Players will also be able to summon monsters in Generation of Chaos VI.
Dengeki PlayStation also reveals Generation of Chaos VI will have a field to interact with and a system where units can bond with one another.