"That person" being Kyoko Kirigiri, of course. A lot of theories suggest, and I think the evidence is too much to ignore, that she saved herself with Kimura's medicine, and that she didn't die.
But as the airing date for Episode 10 of the Future arc approaches, a question comes to mind; If she is revealed to be alive, when you do think it will happen?
Personally, I don't think she'll pop up alive and well at the start of the next episode, like what happened with Hina. Makoto has been carried by his friends (sometimes literally) for the entire show; he needs to prove he can stand up for himself and be the Ultimate Hope. Where Munakata snapped upon learning that his friends had died or turned on him, Makoto needs to be the one that doesn't break, no matter how dark things get for him.
I'm thinking Episode 10 will mark the big confrontation between Naegi and Munakata, the hope-off they've been building toward for this entire series. My guess is that Makoto will be separated from his last remaining friends, and put in a spot where there's no one left to save him. Yet he doesn't break. Despite Munakata's taunts and his own certain death, Makoto refuses to lose hope. And it will be Munakata's turn to get unnerved as Makoto asks to know why Munakata murdered his friends, and if that's really what he thinks hope is.
Pushed into the corner and blinded by rage, Munakata raises his sword to finish the "despair" in front of him, screaming about how there's no one left to help Makoto now, and without his friends he's nothing...
And that's when Kyoko will come back in a big hero moment to save Makoto, as Kyosuke looks on in shock at her apparent resurrection.
So I'd put it at the end of Episode 10, or maybe 11. What do you think?
Your vote: Episode 11