Originally Posted by darktruth
In case you wanted to know, I think it had to do with the fact that vol. 5 LE DVD/BD contained tickets for another special Working'!! (Wagnaria) live event that is going to be held on April 15th. It seemed most of the LE BD edition for this volume went out of stock pretty quickly (Animate could only send it to me a few days after the release date even though I had pre-ordered it about a month in advance) so those who really wanted to attend this event but did not order the LE BD before it went out of stock decided to buy the LE DVD since that also contained tickets.
That makes sense. I had ruled out the idea of there being something like that since BDs didn't really go up much, but if the BDs are supply constrained in any way that could explain it. I guess we'll know for sure if it has a big second week.