Open your browser's console and paste
Code:
document.cookie='ckcy=1;expires=Thu, 16-Jan-2020 00:00:00 GMT;path=/netgame;domain=.dmm.com'
and hit enter

FKG is one of the games which shouldn't require the cookie edit, but it's quick enough to be worth a try.

source: kancolle.fandom.com/wiki/Tutorial:_Proxy_Connection