Responses
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Don't know of the anime but I think this should be the manga. If it isn't the same name, you could try checking the list of alternate names they give as well.
http://www.mangago.zone/read-manga/glass_mask/
So like I'm searching for this anime and I don't know the name.... I remember a girl being murdered in a stage and there was blood and shit.... Then there was another girl that was in an acting class I guess and she shouldn't say the words yes or no while talking to another girl... There was also a yellow bird that escaped and she whistled or something like that and the bird came to her