Usually every single will sell a little less than the previous one, because of the declining market. However, seeing Moon / blossom had no promotion and sold 93k copies, and crossroad has all kinds of promotion, I'm thinking it might also sell about 95k copies. Maybe, if the influence of the blossom PV is big, like 115k? Expecting more than that is probably only prone to dissappointment, seeing that sometimes promotion and multiple versions and tracks don't pay off, while unpromoted singles sell alot.. It's ayu; you can't be sure of anything, except for that she'll be #1.
PS. YMCK remixes would be beyond awesome