This is basically a collection of flashback episodes. I thought it belonged between 7 and 8 since it's numbered 7.8, but I was dead wrong! In fact, the end of the second flashback episode was shocking to me. In a way, it was a good shock. I don't think I would've been shocked as much by just watching the episode 21. Still, I recommend others to watch them in order! Each of the three flashback episodes on this disc are numbered 11.5, 21.5, and 36.5 for a reason. I don't plan to watch the last one until much later.
By the way, did anyone notice how cheap this is?
Watch each flashback episode _after_ watching all the episodes numbered before the flashback episodes.