Step 1
Recommend to play the game on PC's Google Chrome only.
After that, go to.
http://www.dmm.com/
Step 2
Copy Code Below.
document.cookie = "cklg=welcome;expires=Sun, 09 Feb 2029 09:00:09 GMT;domain=.dmm.com;path=/";
document.cookie = "cklg=welcome;expires=Sun, 09 Feb 2029 09:00:09 GMT;domain=.dmm.com;path=/netgame/";
document.cookie = "cklg=welcome;expires=Sun, 09 Feb 2029 09:00:09 GMT;domain=.dmm.com;path=/netgame_s/";
document.cookie = "ckcy=1;expires=Sun, 09 Feb 2029 09:00:09 GMT;domain=.dmm.com;path=/";
document.cookie = "ckcy=1;expires=Sun, 09 Feb 2029 09:00:09 GMT;domain=.dmm.com;path=/netgame/";
document.cookie = "ckcy=1;expires=Sun, 09 Feb 2029 09:00:09 GMT;domain=.dmm.com;path=/netgame_s/";

Then paste it on CONSOLE PAGE on dmm.com, and press enter.
Step 3
Change dmm.com page to japanese language.
This setting should be on the top right of the screen.
Step 4
Go to Kancolle's game webpage and enjoy playing ( ͡° ͜ʖ ͡°)
http://www.dmm.com/netgame/social/-/gadgets/=/app_id=854854/