1) Log into DMM.com in KCV

2) Switch the language of the site from English to Japanese (日本の) at the top of the site.

3) Copy and paste the following line into the URL bar and press enter.

javascript:void(eval("document.cookie = \"ckcy=1;expires=Sun, 09 Feb 2015 09:00:09 GMT;domain=osapi.dmm.com;path=/\";document.cookie = \"ckcy=1;expires=Sun, 09 Feb 2015 09:00:09 GMT;domain=203.104.209.7;path=/\";document.cookie = \"ckcy=1;expires=Sun, 09 Feb 2015 09:00:09 GMT;domain=www.dmm.com;path=/netgame/\";"))

4) Navigate back to Kancolle and it should start!

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Q) It didn't work!

If that doesn't work you can try entering the following 3 lines instead (its the same line, just broken up):

javascript:void(eval("document.cookie = \"ckcy=1;expires=Sun, 09 Feb 2015 09:00:09 GMT;domain=osapi.dmm.com;path=/\";"))

javascript:void(eval("document.cookie = \"ckcy=1;expires=Sun, 09 Feb 2015 09:00:09 GMT;domain=203.104.209.7;path=/\";"))

javascript:void(eval("document.cookie = \"ckcy=1;expires=Sun, 09 Feb 2015 09:00:09 GMT;domain=www.dmm.com;path=/netgame/\";"))

Q) It keeps forgetting the above steps every time I log in!

Go to IE's options > Privacy > Advanced > Check "Override automatic cookie handling", Accept 2x, and "Always allow session cookies". Press OK 2x and try again. Now you only need do the log in once (hopefully)