So, getting a Game Over in the recently released "Kancolle Kai" for the Vita in Japan will give you a C2 error, and will delete your save-file. Now this is what I'd call perma-death!
Video on Nico-Nico: http://www.nicovideo.jp/watch/sm28244556
Some users on twitter also reported that their save files was deleted (Of course, these are in Japanese, put I put the automatic twitter translation too):
Apparently this guy Vita froze after getting the error (With video)
Also, his save's gone too
Source: http://blog.esuteru.com/archives/8508557.html
Video on Nico-Nico: http://www.nicovideo.jp/watch/sm28244556
Some users on twitter also reported that their save files was deleted (Of course, these are in Japanese, put I put the automatic twitter translation too):
https://twitter.com/tomoya_shibata/status/700102801729269760?ref_src=twsrc^tfw艦これ改、ゲームオーバーになるとアプリケーションエラー発生 → セーブデータ消失になる模様
Ship which breaks the application error occurs and the game will be over → will be saved data loss
Apparently this guy Vita froze after getting the error (With video)
https://twitter.com/sato_sandesu/status/699896085507014656?ref_src=twsrc^tfw艦これ改フリーズしたんだけど セーブしてないんだが #艦これ改
Ship will not save this breaks the freeze I got. #艦これ改
Also, his save's gone too
https://twitter.com/sato_sandesu/status/699896325458923520?ref_src=twsrc^tfw艦これ改フリーズしたんで、頻繁にセーブしておいたほうがいいです
Ship should I save often, it breaks the freeze in #艦これ改
Source: http://blog.esuteru.com/archives/8508557.html