First of all, I thought that it was from Japan, but it seems that the first distribution start is "US Android version". Next, it seems that Android version distribution in EU region, Japan, other regions, iOS version will be after that.
[Notice of release of US Android version]
Starting today, the US Android version of "Dragon Ball Legends" is available.
We will soon be distributing the Android version in the EU region. Japan and other regions, iOS version will be delivered soon! Please wait for the delivery to start!#Dragon Ball #Legends— Dragon Ball Legends Official (@db_legends_jp) 2018/5/17