-( Story related, cannot be missed )-
So, surprise! You've just been punked into thinking that the game would end right there after rescuing Mirai. Nope! Instead, we find that there's something else going on, and this was just one ending. This will also prompt you to make a save, as when you continue on, you'll start with the events of the Prologue before it time-skips you forward into Chapter 6, Path 2. Possibly expect this one more time, that's all I'm saying now.