Timeline for Legend of the Demon Womb *SPOILERS*

I think what the story was trying to convey was the in-between plots in the movie that happen at some point in time after Urotsukidoji chapter 1 and 2 but before the end of chapter 3. The story clearly shows by the attitudes of the characters that there is a relationship with them all. They must have obviously become used to their situations but then, after the whole crisis with Munni Hausen, Jr., Nikki then became a half-demon and then the film's timeline progresses to the point where it leads to the end like usual. I am only theorizing this, I could be wrong. But if done that way, then it makes sense chronologically. But still, why do it like that when they could have just put that part of the story in sequential order? I don't know. Whatever. That's like having a comic book run for three issues in a limited series, and then bring out two more "special" issues after the series ended saying that the following issues take place after issues 1 and 2 but before issue 3. Why not just make five issues in numerical order? You get it?