Talk:Episode 12 - Stand by Oneself/@comment-86.185.175.199-20171001011707/@comment-30834068-20171001024702

I gave this same answer to someone else months ago.

Mei did not tell anyone for most of 10 episodes because so far as she knew there was nothing that could be done about it. And because telling anyone before the middle of episode 7 would have broken the charm that her 'nonexistence' supposedly gave the class. In episode 10 she heard the tape, of sending "the dead back to death will end it". She was about to tell Kouichi then, when they were interrupted by Teshigawara. At the end of episode 11 she resolved to kill the Extra herself and went off to do it.