I play exclusively on mobile, this and DraPro. Recently Kamihime stopped working smoothly on mobile in Chrome. On android, I now use Dolphin browser (with a performance add-on someone recommended); that works for Android, but not iOS. Nor does it work for DraPro as screen resizing seems to be an issue.

I've not yet found an iOS solution. Clearing all data from Nutaku.net, restarting the device and restarting the game gets me through a battle or two before it crashes. Then I repeat the process.

My advice would be try out different browsers (puffin, dolphin, safari, anything else you can find) until you find something stable. Then post back here!

Of course the game may get fixed in the meantime. If mobile compatibility was important to the Japanese market, chances are they fixed this in an upcoming release somewhere.