Ok... this thread is doomed to be forgotten soon... but I just HAD to post about it.
Basic story in this JRPG is this:
Two high school students find themselves involved in weird incidents. As they investigate, a flaming red head appears before them, explaining that theres an evil organization causing disruption through the worlds and she seeks aid. Her name... Shana.
As the high school students agree to help, they must travel through different worlds, acquring help from their residents, in order to defeat this new enemy. In their path they will meet Index, Taiga Aisaka, Dokuro-chan and many more characters, as they face off different enemies like Hecate or Accelerator.
Yeah... light novel crossover.
So far I know there are characters from Shakugan no Shana, Bokusatsu Tenshi Dokuro-chan, To Aru Majutsu no Index, Toradora, Asura Cryin and many more.
A trailer:
http://www.youtube.com/watch?v=BhvJ_F0ISMU
I think I'll import even if I can't read japanese.