Then who's flying this plane?
Okay, but for real, I was going through the second Main Game again to write the plot summary, and maybe I'm just dumb, but is it ever brought up who the Keymaster was in the beginning of the trading phase? Because if we're to believe Q-taro and Keiji's story (and they did have the roles they said they did, confirmed by Safalin), then Keiji lied about trading his Keymaster in the first place, which is brought up but then kind of forgotten because there's more pressing matters to attend to. When the whole thing with Sou and the Sacrifice is discussed, Keiji comments that it means you can force two people other than yourself to trade, and Sou makes an off-the-cuff comment about him knowing that for certain.
Anyways, my point is that Keiji forced a trade between Sara and... someone. No one claims Keymaster to start, so it's a mystery who it is. Gin says he was a Commoner the whole way through, I remember that. But who's the someone? And do you guys think it's even important? Because ever since NDRV3, I've been very suspicious when seemingly relevant evidence is glossed over in trials.
Even so, I do think it'll be brought up in the third chapter that Keiji lied to Sara to gain her trust, because, uh, dude? Didn't you criticize Sou for doing the same thing to Kanna? And what the Hell was that "will you die with me, Sara?" convo during their investigation? I have so many questions about Keiji and none of them have answers.