We Just Go Hard/EUPHORIA sold about 205K copies in the 1st week of release
With this , KAT-TUN now has 29 straight #1 singles & it's their 2nd back to back single that sold about 200K copies , 1st week sales wise
https://www.oricon.co.jp/news/2206893/full/
Congrats even though I'm surprised with this being their 1st double A-side single release , the sales should have been higher :s