Ichika's had the power to raise the dead all this time? She should summon some zombie hordes to do her bidding. Saya's no match for zombies, I bet.
Anyway, something unusual I've noticed about the Uta Kata narrative is the constantly shifting point of view. Early on, the story was told almost entirely from Ichika's perspective, looking back on the past. As the story has progressed, however, we've seen more and more from Manatsu's perspective. Meanwhile, current events have seemingly caught up with Ichika's narration.
I'd like to think there was a specific reason for the shifting perspective, especially considering the "I am you, you are me" nature of Ichika and Manatsu's relationship, but I fear it's just plain ol' sloppy storytelling.