NANA sold like crazy on the first few weeks and it's quite stable in long run.. REIRA was the one surprising me.. ENDLESS STORY sold ~90K on the first week I think (got no. 2, NANA got no. 1 on the second week)... then ended up over 340K. Also, REIRA stayed at top 5 for quite a long time (longer than GLAMOROUS SKY I think)..
so I really wish that ayu won't release anything during NANA/REIRA weeks...
Edit: I do agree with you immel... Eventually ayu won't get no.1 and probly she will get lower and lower in terms of sales and ranking.. But it's just personal feeling.. I wanna see ayu to get more no. 1s...
