The series is told in chronological order with the occasional flashback, but the narration is handled by a different Vitro in each issue, allowing for a variety of equally interesting and valid perspectives to be represented. It's unusual to be jumping around to different narrators so often, and it is always slightly confusing at the beginning of each issue; until the narrator identifies her/himself, the reader isn't quite sure who s/he is following. That isn't helped by the fact that, as far as I can tell, all of the vitros have identical fonts and narration balloons. Despite the slight and temporary disorientation (which actually feels intentional), the likeness of inner voice serves the story remarkably well. It provides a powerful sense of community that is diametrically opposed to the antagonistic way in which they act with one another, netting complexity and the distinct impression that no matter how different and horrible these people are to one another, they are ultimately bound together by something much deeper.
Issue #5 picks up after the MONSTER cliff hanger that was Issue #4, and we get to see the first problem that the vitros have to come together to solve. It's messy and moving and I can't tell you too much more, except don't miss it. It's coming out soon, so if you haven't checked out the series, you can preview and order the first four issues here.