Mahiru Shiina 椎奈真昼

This prisoner is a cheerful woman, who talks and smiles a lot. Self-sacrificing, devoted and treats others indiscriminately, no matter who they are. Despite being the oldest female in Milgram, she is gullible; often made fun of and deceived by lies, she always laughs it off without a thought. Her presence in Milgram is therapeutic.

In interviews, she openly talks to the prison guard, even harbouring special feelings towards them; however, during this time, one can also see an expression different to her usual bright demeanour, one which is mature and forlorn.