UNLIMITED

The information below is sourced from: 
http://datv.jp/shopping/user_data/packages/default/khj-1st.html
http://store.universal-music.co.jp/fs/artist/kimhyunjoong/pdci1008
Translated by OnlyKHJtimes (http://onlykhjtimes.blogspot.com / @onlyKHJtimes on Twitter)

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*In Japan, the most important thing is volume of albums sold, as recorded by the Oricon.*
Here are few sites that non-Japanese fans can look at to preorder their copies now: CDJapan site, HMV (http://www.hmv.co.jp/en/) and YESASIA.com, all sites are in English. For HMV, go here for step-by-step instructions (in both Korean + Eng) on how to order. All these sites count to the Oricon.

If you read Jap, you can go to Amazon.co.jp to order too. You can start from here: http://amzn.to/vVYeBB and just search for his name in Jap キム・ヒョンジュン. Of course, there's also the DATV site to order if you read Japanese too. Basically, all Japanese sites that sell the album will count to the Oricon. So if you're ordering from a Japanese site, no worries, it will count.

(NOTE: DATV shopping website doesn't accept the order from overseas)