The commercial impact of anime goes well beyond its disk sales. Manga may sell to more people, but anime is extremely visible, airing on TV (albeit often late at night) and propagating around the internet at a very rapid pace. This visibility very often can lead to an increased strength of the franchise in general, propping up sales of print material, figures, and any various other related goods. Sometimes, anyway. 2013 was no exception, and saw a number of manga adaptations have anywhere from minimal to explosive effects on the sales of their source material.
I collected the manga sales history, including thresholds for series which charted sporadically, on this doc, and plotted it below. Note that these sales are not total, but the total number reported in a roughly fixed time period. Comparing sales tail length is a whole other issue, and I’m trying as much as possible to compare like figures.
One important difference from similar breakdowns of 2011/2012 series is that here I’ve opted to use the total sales from a series’ first 2 weeks of release (the highest reported total in that time interval), to attempt to minimize the effects of a bad split in creating artificial variations. It’s still an issue either way, but the difference between 9 and 14 days is a lot less than the difference between 2 and 7 days.
Two important series-specific notes prior to the plots. First, Maoyu is plotted here, in the manga section, because the manga charts more consistently than the light novel did and, more importantly, has available data from both before and after the anime aired (the LN ended just prior to 2013). Second, I can’t parse impact for series that don’t have at least one volume which released after the anime began to air. I thus will not be covering Servant x Service here, though there is data available. I will cover it in an addendum post come September when volume 4 has been out for 2 weeks.