I’m adding the 2010 manga-adaptation anime into the sample of adaptation effects on their source material. Many, though not all, series show some degree of significant bump. Nitty-gritty data is collected here, and displayed below. An impressive 20 of the 26 series I looked at made the Oricon charts at some point, though one of them (Rainbow) ended before the anime began. One that didn’t, Seikon no Qwaser, is still running at 8 years, 18 volumes (it’s hardly the only series to run that long without charting, I’m just pointing out that manga can run for a long time without seeing the light of day chart-wise).
Note: For High School of the Dead, both volumes 4 and 5 came out well before the anime, and volume 6 came out during its broadcast. The gap in time was so big that they came out before mal tracked numbers for series, only posting top 10 lists. I used the available 2008 manga data to approximate the average value, in volumes, of the #10 slot to get a rough estimate of the threshold. Even holding v4 and v5 to the maximum threshold from those weeks, the 130,000 v6 and 200,000 v7 it puts up post-anime is evidence of a significant bump.
Arakawa Under the Bridge
High School of the Dead
House of Five Leaves
Kaichou wa Maid-sama
Kiss x Sis
Nurarihyon no Mago
Soredemo Machi wa Mawatteiru
The World God Only Knows
Series that didn’t chart period, thus not having info available to plot (this does not necessarily mean they didn’t get a boost):
B Gata H Kei
Dance in the Vampire Bund
Otome Youkai Zakuro
Seikon no Qwaser
Tono to Issho
-While not the original source, the Shiki manga was running concurrently with the anime (same principle as Maoyu in 2013).
-Giant Killing plateaued prior to the anime, which makes the prolonged, steady rise in its wake particularly impressive.
-Some series, notably Mitsudomoe, Kiss x Sis, and Kaichou wa Maid-sama, seem to show either blips or brief increases that didn’t sustain themselves over time. I’d be inclined to chalk this up to how people responded to the present state of the manga; anime might get people to start reading it, but the core content has to be what keeps them there. This is the inevitable fate of manga in general, as many things can cause people to fall behind on a series when it starts to span half a decade.
Poor Maid Sama. The anime didn’t sell so well (but as it’s a shoujo series that’s not unexpected), and any boosts, if any, were temporary. Luckily, the manga was already selling a lot in the first place (100k+ is quite respectable) so I guess they’re fine with that.
By the way, do you have manga sales data for Special A?
Anime aired in 2008, so I have no idea how it changed, but the last 3 volumes of Special A are in the 2008-2009 manga charts:
14, *57,955 *57,955 Special A vol.15
17, *64,593 *,*64,593 Special A vol.16
22, *40,078 *,*40,078 Special A vol.17
Also, semi-late reply, but do you have any manga sales data for Welcome to the NHK? I’m very much aware that the anime is way more popular in the West than it is in Japan, but was the manga ever popular in Japan in the first place?
Last volume of the NHK manga came out in mid-2007 in Japan, about 6 months before myanimelist started to even post top 10 charts. I don’t know where I’d start to look for good print data on it. I’d assume the novel would have had to hit a minimum threshold for an anime to be considered viable, but that could mean any number of things.
I did find a set of tohan rankings, and NHK’s last volume came out on July 26th, corresponding to this release week: http://www.php.co.jp/fun/ranking/books.php?genre=f2007-08-01
It didn’t chart, which means it was probably less than a 100k manga. To say anything more than that would be speculation.
That same week, it lost out to Zipang v30, a series which typically put up around 60k in first-week sales. So probably lower than that.
Meaning even the manga was never popular in Japan?
There’s no available evidence for it, no. Monthly Shonen Ace isn’t exactly a top-tier magazine, but even then sub-60k sales is plenty of grounds to say that it didn’t have a huge fanbase over there.
Wait, I just remembered that NHK was originally a novel. Any sales data for that?
Nothing, as far as I am aware.
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