Board Thread:News and Announcements/@comment-5774380-20150416171240/@comment-5774380-20150421131052

Oh, good observation. You're right, I can't find the dates in which the sales of Volume 15 were recorded, but those of Volume 16 were recorded indeed between April 9-12. Taking an average of 217,173.5 units per day, that means a total of 1'303,041 in the same 6 days of Volume 15, not counting the limited edition. I doubt there was an increase that large though, but it seems that actually there was no drop.