User blog comment:Dragonjet/KC3改/@comment-26415148-20151012120730/@comment-1820055-20151012131406

Yes text input does not work on the frames

You'll need to login to DMM separately on a chrome tab, and set its language to JP so that cookies will work automatically as well.

Just make sure to check "Keep me logged in on next visit" so you won't need to re-login each time.