And here what had happened ... coming! From writing this manga, the author announced that he would make a short series of 3 or 4 volumes, with the surprise success of this title in Japan (which will lead including an anime and film) number tomes provided for was revised upwards (9 volumes currently in Japan). Unfortunately while the first volumes were extremely successful, I found it really empty: repetitions of some gags, not really comic scenes, and a blatant lack of inspiration from previous volumes ...
I hope the author is given in the following volumes, but I think this time I would try to flip it before you buy it.