Shannon, Kanon, or both basically HAVE to be the murderers for Ep1, due to restrictive red text. In addition, since they're around for the Tea Party like the rest of the survivors, well...
As for Genji, I wouldn't be surprised if he was ex-military. He does constantly talk about Kinzo having done him a massive favor long ago, and I don't remember if that was ever explained or not. Since Kinzo was also in the war, as I recall... could he have saved Genji's life?
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