Maybe "modern history" in this context refers to like the modern era, once friend takes over the world, the world will completely change (or perhaps he will wipe out the world)
Right in the gut with all this new information. So Kiriko helped create the virus and created a cure in order to make Friend appear as a savior. That explains why they were ready with a vaccine so quickly. Damn, feel bad for Kanna. Her mother essentially destroyed her life and hurt the people she loves most.
