This is "season 6" of Angel, following on from the climactic last battle that ended season 5 on TV. Here we get to find out what happened next (four years later in my case, so my memory of the end-of-season cliffhanger details is a bit faded). It's not good. In fact, it's Hell.
It takes most of the first four "episodes" to figure out what has happened to all the gang, in the usual condensed elliptical comic style. Then the fifth "episode" is a giant battle against demons (not much changed there, then), ending on a massive cliffhanger. So I had a quick peek at Amazon to see what Volume 2 has to offer --but it appears to be a flashback, to explain what happened immediately after that season 5 battle, before the volume 1 events. Ho hum.