I play it on my phone when I am omw to work or smth.

(I use chrome on a Samsung Galaxy Alpha btw)
All you need to do is obviously log into the game. And then get into your home screen.

Then hold down onto the "My Page" button in the top left of the game and ask the browser to open the link in a new tab.

It's not perfect, but it seems to work quite well that way. You can swap to almost every area through your home screen.

This is also a great way to play the game on full screen on your pc if you prefer that haha. Looks kinda.. weird though, you can even zoom in ofc.

For anyone to lazy to do this. The link to "My Page" http://www.drapro-nutaku.dmmgames.com/mypage
You will have to be logged in for it to work properly.

Anyway, Have fun
Tardor.