Despite being fairly different in nature, this plot reminds me of Mirai Nikki. If I can measure up to the Cardboard Tube Samurai's standards, I think I'd like to play. I am also intrigued by the PCs needing to die, which I guess was the point of the phrasing, given the ellipses. It's especially interesting due to corpses being possessed by demons.

Anyway, interest hereby expressed.