Hey, I have to answer the questions:
No, the number of episodes isn't 12, it has to do with something else.
Furthermore:
No, she is not from Genshiken.
From what I know, she has not been forced to do something she didnt like (although she had to make a hard choice, she chose to do it by her own will).
No, there isnt any killing (well, there is if you think commercials kill you)
So that's hint number 3: Commercial