Can one watch it before completing the entirety of the TV series?
Gintama general, I suppose.
I don't see why not. It's shit though, just like all of Gintama's serious arcs.
>Genderbender arc will never be animated
>Sugita will never voice the most qt 2d girl ever
WHY THE FUCK NOT
All of Gintama is shit.
>All this shit taste
Watching the series is pretty much mandatory since it builds off established jokes/ plots
For most enjoyment you'd have to watch the rest of the series and know these characters.