I'm a bit confused about the data. If 1,000 is the minimum to register, how is volume 5 at 933 and volume 4 at 1,250? Shouldn't they also look like volume 6's representation?
Also, volume 6 ends with chapter 46? Does volume 3 cover the end of the novel's story? Is that why there's such a drop-off?
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With Shoseki rankings, you can only estimate sales if a manga reaches either the weekly or monthly ranking.
Volume 4 did not reach the weekly ranking during the week it was released. At the time, a manga needed to sell at least 1,250 copies to appear in the ranking, so Volume 4 sold fewer than that.
Volume 5 did reach the weekly ranking, so it was possible to estimate how many copies it sold. During the week of its release, a manga needed to sell at least 900 copies to appear in the ranking.
Volume 6 is in the same situation as Volume 4: it did not reach the weekly ranking, and during its release week, a manga needed to sell at least 1,000 copies to appear in the ranking. So we can conclude that it sold fewer than 1,000 copies that week.
As for the novel, there are only two volumes. The first volume, which contains the content from the web novel, was covered by the first four volumes of the manga. The second volume of the novel starts at Volume 5 of the manga.
And yes, Volume 6 ends at Chapter 46, but the material the manga is covering now comes from the second volume of the novel.
As for why there was such a drop in sales from Volume 3 to Volume 4, I honestly don't know. The second volume of the novel was released on December 22, 2023. The second volume of the manga came out on January 18, 2024, the third on June 19, 2024, and the fourth on September 19, 2025.
According to Japanese readers, the novel was canceled because of the poor reception of Volume 2, although it's unknown exactly when the decision to cancel it was made. So maybe it was canceled after Volume 3 of the manga was released, and some readers who liked the novel decided not to continue buying the manga after that? I don't know.
The continuation of the manga after the novel was canceled is a mystery to me, especially considering how low the physical sales figures are.