Satoko Katsuta, nicknamed Sato-chan, is the navigation officer and substitute helmsman aboard the Harekaze. Hailing from Matsuyama in Ehime Prefecture, her family's international trade business immersed her in Russian culture early on, fostering a fondness for the Russian language, literature, fairy tales, and foods like pirozhki. This background also influences her speech, frequently ending sentences with the Ehime regional tic "zona." She stands 160 cm tall with distinctive purple hair styled in a single tied bunch and green eyes. Her typical attire is her maritime school uniform, often accessorized with large yellow hoop earrings. Born on October 1st (Libra) with blood type O, she holds a Second Grade Junior Maritime Officer License and a Second-Class Small Watercraft License, qualifying her as one of only four Harekaze crew members for medium skipper duties. Her primary responsibility involves managing sea charts and route planning in the chart room below the bridge. She steps in as helmsman when the chief navigator is unavailable, proving reliable even under the pressure of naval combat. Candid, straightforward, and calm, she helps maintain a steady atmosphere onboard, valuing honesty epitomized by her favorite saying: "My word is my bond" or "A promise is as strong as iron." Academically strong in political science, economics, and social studies, she dislikes chemistry. Her hobbies include studying Russian and political economy, and her favorite color is silver, though she avoids Japanese sweet potatoes. She collaborates closely within the navigation department and occasionally assists other team members, managing distractions like the ship's mascot cat, Isoroku during critical operations. Inspired by her family's maritime connections and her own prior boating experience, she developed her navigational proficiency.