lol @ people thinking there's a "Avex magic" conspiracy to boost the sales. the haters are really reaching
if there is a such a thing, why wouldn't they have worked their "Avex magic" on GUILTY? there was only a small difference to Kobukuro & I think the album #1 streak was much more of a big deal.
much more logical explanation for the sales peaks is the tour. lots of people who don't buy singles go to her tours and probably after seeing mirrorcle world live (and getting the promo message about the single) decide then to buy it.
besides , saturday & sunday are the biggest sales days besides the debut date anyways. I don't see anything weird about the sales figures.