Future

I think that this war is going to end to the opposite way that our protagonists want, it'll be shocking and chaotic and it'll devastating to them. The death of a friend maybe? Or the deaths of several hundreds, thousands of people on their hands. The loss of a family member? Add that to maybe losing the war to an astronaut? And it'll kick start the events that led future Sunny to tell his past self that he cannot handle the future.