>>6132029Oricon reports sales numbers for its weekly Top 20 and for the three highest on the daily chart. Ghost sold 3,502 copies on release day which got it first place and 6,263 copies during the first week. This week 4,369 downloads was enough to make it to the chart, but neither Bluerose nor Comet made it, although they were 5th and 6th on the daily chart. So they must have sold at least 1895 units less than Ghost during the week. On the other hand, Ghost seems to have gotten really lucky in that the previous major release seems to have been two weeks prior, so the second place was taken by a song with 2,873 downloads and third with 1,939 downloads. So on a similarly slow week it might have been possible for Bluerose and Comet to take first and second, or at least second and third, since based on a song they beat popping up third the next day, they seem to have sold around 2000 units on the first day. Instead they were up against three fairly new Yonezu singles and a BTS single released the previous week.
Oricon seems to be missing at least one digital store: Ototoy, which is the only(?) place you can buy FLACs and ALACs, so it might actually have an impact depending on how many Japanese feel the need to own a lossless copy. It's also dominated by chuuba music: On their yearly chart Next Color Planet is the 2nd, Ghost the 20th, Ghost (Hi-res) 78th and Bluerose/Comet (Hi-res) 83rd. Of course, since it allows foreign credit cards etc. that's where everyone around the world buys their FLACs which no doubt inflates chuuba numbers, but a sale is a sale.
Nevertheless, Oricon is still probably pretty good indicator of the total domestic sales. Although it's weird that Kiseki Knot was 8th on Oricon yet didn't appear on Billboard at all whereas Bluerose did. The difference between the two seems to be that two online stores more report their sales to Oricon, but it's hard to see how two stores could make such a huge difference on Kiseki Knot's ranking. At any case two stores less probably means that both Ghost and Bluerose got a boost to their rankings since it seems that those two stores sell more mainstream stuff and thus more marginal stuff like chuubas do slightly better on Billboard. They also start their week on different days, but both Kiseki Knot and Bluerose should be unaffected unless there was some huge spike on the eve of Coco's graduation that made Kiseki Knot 11th on Oricon daily chart and thus unranked, and too late to count for Billboard, but this seems unlikely given how high it ranked on release day and how well the song below it sold the next day when it bumped up again. Rather it seems like most sales were made on the first day. So something seems fucky about the charts, but I guess the broad strokes are correct.