I question the trivia about Hina. It seems to say that she had forgotten about the whole experience and was deaged. The problem is that this doesn't fit all the things in the story. First, in episode 1, Hina tells Aoba that he told her that he was going to be attacked which he did in episode 8. So the trivia can fit with that but it doesn't explain why Aoba has his memories and she doesn't. I think that actually, she is a war orphan who lost her parents in a battle but somehow lost her memories during that battle. The Hina from episode 1 has returned to the time she left from. So she went farther into the future than Aoba did after going through the portal. Any thoughts?