I already read 5 volumes, and I was happy to hear that there is sequel for this series. I understand that the series end in 5 volumes, but the bangaihen is still ongoing and have 7 volumes. I already read the bangaihen and it's definitely a sequel, but I don't understand. If there is sequel why not put in a new page? And 7 volumes of bangaihen, does that mean including the finished 5 volumes? 7 new volumes of the series? Or there is some mistakes in editing? Because so far there is 7 chapters of bangaihen released, so it must be 7 chapters not 7 volumes