This app was mentioned in 3 comments, with an average of 1.67 upvotes
You can download it from the Google Play Store onto your PC and install it onto your phone. If you don't have a PC for whatever reason, search up Qooapp.
Source: http://sao-md.bn-ent.net
Google Play Store: https://play.google.com/store/apps/details?id=com.bandainamcoent.saomd
The game was released today. For iOS, the easiest way to get the game is to make a new iTunes account for Japan by switching to the Japanese iTunes Store on PC (scroll all the way down) and downloading this app. iTunes will prompt you to make a new account. Make sure you use a Japanese address. Alternatively on iOS devices, scroll all the way down App Store home page, sign out and create a new account for Japan.
I am not sure what you would need to do for Android. Maybe somebody else can jump in here.
It makes me wonder if Bandai will release an English translation but for now this will have to suffice!
Yep. Here are the links
IOS: https://itunes.apple.com/jp/app/sodoato-onrain-memori-defuragu/id1138599575?mt=8
Android: https://play.google.com/store/apps/details?id=com.bandainamcoent.saomd
QooApp: https://apps.qoo-app.com/
For Android, you can either use QooApp or you can use a VPN and set it to a Japan one. I used the VPN method. For IOS, you must have a Japanese Apple Account to install it. Enjoy!