Oricon sales aren't great but...nobody cares about recochoku ? LOVE is doing very well !! In japan recochoku is more and more important, a lot of artists doesn't sale a lot in physical but have great sales in recochoku ! (Kaela Kimura for example)
well, "Missing" is still n°1 in chaku uta since its release, and "song 4 u" and "Missing" are in all of the top 5, LOVE does much better than party queen or her others singles...
Last year was one of artists most downloaded in japan, don't forget that, don't be obsessed by oricon.
http://recochoku.jp/recochoku_ranking/