Ouch. God knows why a company would release part 2, 3, and 4, of a manga, all at once... For heavens sake, they could at least speed up the initial part 2 delivery if they're going to do that. Only reason I can imagine is part 2 can't have more people added to go faster, so they're releasing all the others at the same rate to bundle them all in the end, sell them as a finished package. And letting people go from the light novel into the manga depending on the part, maybe.