Lol, so whenever I play a game with the Japanese audio, I always find myself learning something new. I know only a few of us know Japanese, so I'll also be sure to include romaji for you non-readers.
So, anyone can post Japanese words or phrases that they learned while playing Corpse Party.
I'll start it off with 2 that I heard quite often.
懺悔 (ざんげ）（Zange): Repentance
多重空間 （たじゅうくうかん）（Tajuukuukan): Multiple spaces (in reference to the several different versions of the school existing simultaneously. Tajuu means multiple and Kuukan means space;room; air space.