Moeka "Moka" China captains the Musashi, a Yamato-class battleship crewed solely by elite students from Yokosuka Girls' Marine High School, a role reflecting her acknowledged leadership and academic prowess. She possesses light gray shoulder-length hair, purple eyes, and a small red hair clip on her left side, typically dressed in a black officer's uniform with leggings, boots, and often a captain's hat. Born on July 25 in Matsumoto, Nagano Prefecture, the Leo stands 158 cm tall with blood type AB. Orphaned in childhood, she grew up in a Kure orphanage where she forged a deep bond with her closest friend, Akeno Misaki. Inspired by Moeka's mother, a respected Blue Mermaid, they shared a dream of joining the organization, a commitment enduring their separation when adopted into different families. Moeka champions hard work over innate talent, living by her motto: "There is no genius that beats hard work." During the Musashi's voyage to a maritime exercise, the ship drifted off-course, and a RatT virus outbreak infected most crew. Moeka barricaded herself with three uninfected students on the bridge, using a temporarily repaired radio to send distress signals. When the Musashi threatened to spread the virus via the Uraga Channel, she signaled the pursuing Harekaze—commanded by Akeno—to maintain distance due to remaining ammunition. Following a battle, Harekaze's crew boarded, rescuing Moeka's team and reuniting the friends. A month later, Moeka aided Akeno in preventing the Harekaze class's disbandment, participating in a live show that triggered disciplinary action for revealing classified information. During an anti-piracy operation, she masterminded coordinated ship movements and predicted enemy tactics. She utilized specialized paint shells to guide Harekaze during a critical assault, demonstrating her trust in Akeno's capabilities. Moeka holds licenses for secondary-class ocean navigation and small-vessel operation (Class B), excelling at canoeing. She has no disliked foods or academic subjects and enjoys hayashi rice and shortcake. Her relationship with Akeno proves foundational, frequently motivating both to surmount challenges.