Tsubame Kawano is the deputy captain of the Shinano, a large direct education ship crewed by students from Maizuru Girls' Naval School. Her surname translates to "river" and "field/wilderness," and her given name means "swallow (bird)." Standing 156 cm tall, she presents an orderly appearance reflecting her serious disposition. Originating from the engineering department, she possesses expertise in machinery and equipment maintenance, informing her practical approach to ship operations. Exhibiting methodical calm, she prioritizes rational decision-making and broad situational awareness, often stepping back to assess contexts. She emphasizes routine and health, enforcing regular rest periods for both crew and machinery, notably insisting the energetic Captain Azumi Abe adheres to sleep schedules. Her responsibilities involve mitigating the captain's impulsive tendencies and ensuring protocol adherence, earning her the crew-bestowed nickname "Tsubame Executive." She lives by the principle that "watching from the side gives a clearer view," highlighting her observational skills. Her technical proficiency extends beyond machinery to consistent academic excellence, with no weak subjects; she excels particularly in mathematics and speed skating, reflecting her disciplined nature. In crises, such as preventing the Shinano from being overworked, she intervenes decisively to maintain safety and operational integrity. She monitors crew well-being and addresses emerging issues swiftly, acting as a stabilizing force. Her key relationship is her dynamic with Captain Azumi Abe, uniquely capable of restraining the captain's rash actions. Trusted by the crew, she provides guidance balancing strictness with genuine concern for collective welfare. Trivia includes her birthplace in Sabae City, Fukui Prefecture, birthday on October 8 (Libra), blood type A, favorite foods of fried tofu and habutae mochi, disliked food yam, favorite color orange, and preferred flower iris.