The sales for Kingdom Hearts 3D are on par with Birth By Sleep atm.
Birth By Sleep week 2: 66k
3D week 2: 62k
Very good! 3D will have the highest opening for a handheld Kingdom Hearts game though in the US, based on the pre-orders from this site (not sure if it also includes the special edition).
Read my original story on Fictionpress (Shinigami Twin): http://www.fictionpress.com/s/2996503/1/Shinigami-Twin
As well as my other one (Hell's Punishment): http://www.fictionpress.com/s/3085054/1/Hell-s-Punishment
Nintendo Network ID: kingofe3