It was kinda hard to make the story clear in the video in only 2-3 weeks. I know that at first you dont realize the girl is dead and trying to go back :P but after reading the story everything should be clear XD
Killing MD/Ghost just means that "they had to solo a monster, instead of having friends helping them" to achieve their goal.
The story is hard to understand =/
Someone gave me an idea for part 3 lol (its actually pretty good, and not something you'd expect)... maybe someday