I guess at the end of the episode Yuuki was just about to tell Mirai that he's already dead and Mirai will need to let go. Mirai seems to be a bit too levelheaded to believe in delucions too long as her fabricated reality was already cracking with memories of Yuuki's death. It remains to be seen how she will actually deal with the knowledge once it hits and she can no more escapa the inevitable.

Of course the biggest question of whether her parents still live remains. But I reckon they do, seeing how Hina and the grandma were still living as well. Yuuki will likely be the only sacrifice. Although I'm fully prepared to be proven wrong as well.

I wonder if Mari will leave Hina and her mom behind to catch up with Mirai. In a certain sense it would be reasonable since there's no reason why the little girl couldn't survive in such a controlled environment and with the knowledge her mom is well. However, there's no guarantee Mirai will make it all alone out there. The soldier probably thought she knows exactly where she's going and will be well over there.