Aki Natsuki (安岐 ナツキ, Aki Natsuki?) is a nurse who works for the Japan Ground Self-Defense Force (JGSDF) and was assigned by Kikuoka Seijirou to oversee Kirigaya Kazuto's medical condition at «Chiyoda Hospital» when he was hospitalized as well as during his rehabilitation. She is later assigned to watch over Kazuto during the «Death Gun» incident and after Kazuto is injected with succinylcholine.