Hideko Yamashita, nicknamed Shū-chan, is the port-side navigation controller aboard the Harekaze destroyer. Her duties involve monitoring port-side conditions and assisting in ship navigation. She presents a distinctive look with hair secured by a pink ribbon across her face and perpetually closed eyes. Her cautious nature echoes her favorite adage: "Knock on a strong stone bridge before crossing it," guiding her careful decision-making. She exhibits attentive listening, reinforcing her supportive role within the crew. Personally, she favors boiled tofu but dislikes soft-shelled turtle. Academically, she prefers political science and economics while finding mathematics challenging. She stands 145cm tall, has blood type A, and was born December 13 under the Sagittarius sign. Her hometown is Yokosuka in Kanagawa Prefecture. Her given name Hideko combines "excellent, outstanding" (秀) with "child" (子), while her surname Yamashita fuses "mountain, hill" (山) and "under, below" (下).