Well... This is needing a update, i can't create an account, nor download from this
if by download, you mean downloading the game, then there's actually nothing to download aside from a google chrome extension. there's actually a separate thread specifically for signing up for the game, but you'll want to visit mbga.jp on your phone (or through google chrome by spoofing a mobile browser by using a browser switching agent) it's best to do it through chrome because of the translation feature, which'll help with navigation.
I just need more info on four teams actually. maisen, their rivals and their rivals at shinozuka, and the new hebijo girls and the arc angels. specifically how their rivalries and inter team dynamics are. more info on Yoshimitsu and matsuri's characters as well. its a mobile game so im not exactly expecting a lot of character, but man am I curious.