I've tried it on three different devices and can't get it to run. The page just keeps redirecting back to itself over and over.
Edit: Got it working.
Get Bluestacks or an actual phone, point browser to dmm.co.jp, yes I am 18 years old, login, and only then go to the game page at
You must be registered to see the links
If I ever learn enough Japanese I'll make a UI translation.