What is this craziness - Chapter 5 Episode 0 PSO2

Well I been playing this game for a long time now and not once tried the campaign yet and what is this craziness. First starting at chapter 5 and the episode 0? Where did 1 to 4 go and why not episode 1? Phantasy Star Online 2 logic I guess.

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Outro song - Neffex - Crown