Hmm, where have we heard this before? A mad toy doll in charge of the lives of a bunch of humans with murky pasts and tortured souls! Seems like NIS is borrowing liberally from Spike's Danganronpa when it comes to Exile Election.
The game sees a dozen unwilling contestants trapped in an amusement park with the mechanical monster toy hosting regular elections deciding who gets bumped off. To survive you, as Kaname Ichijou, need to figure out who killed your little sister in a previous election. Dive into the others' personalities and weaknesses to gain leverage over them, trying to dupe them into keeping you alive.
The official website has the first character information, but I think we all know where this is headed!