A petite, older sister whose memory isn't very good. She can't remember things that happened but five minutes ago. Her sense of direction is pretty bad, too. Her traits could make her a burden, but her friends, along with the memos she carries to remind herself of things, help her along quite a bit. In the end, she has proven herself and the results show. Odds are that she doesn't remember why she's participating in the Joint Military Exercise, but that doesn't seem to be bothering her very much at all.
Shiratsuyu is acting as assistant to Aoba for her interviews. How will Shiratsuyu fare?