SHORT...VERSION: Demons invaded the castle, and they screwed with Souji's brain and made him give in and turn into one for a while. In order to become one, he, uh... sacrificed Chie and Nanako. Nanako got away, but Chie sorta died. Then got better. And now EVERYONE IS EMO because Souji's human again and etc etc.

And then there's everyone's individual angstfests but those are ~complicated~.

But their favorite punk might cheer'em all up! Except... Adachi... who hates everyone because he is Adachi.