"How is this possible?" Yusuke reaches up, delicately touching one of his temples while a disturbed frown furrows his brow. "Did they do something to our minds before we awoke here? If so, what else could they have done to us?"

Maybe that's why Futaba knows him while he doesn't remember her. The idea that someone has tampered with their brains truly is horrifying. Could it be used to force them to kill if their captors desire?