Talk:Episode 10 - Glass Eye/@comment-173.32.213.148-20150106015123/@comment-397235-20150107011622

It's Takako's death, or at least the witnessing thereof, which prompts Mei to finally decide to do something about the Extra. She picks up her classmate's knife...thing and tells Kouichi all the horrible things they've witnessed would stop if they kill the Extra. Up until then, she wasn't anymore vested in ending the Curse than the others.