Maron Yanagiwara, commonly called Maron-chan, is Chief Engineer aboard the destroyer *Harekaze*. Born in Chiba Prefecture, she proudly identifies as an Edokko, embracing Tokyo’s dialect and festive traditions. Her birthday is August 8 (Leo), height 146 cm, blood type A. Her engineering expertise stems from childhood maintenance of her grandfather’s fishing boat, granting deep knowledge of ship engines. This background proves crucial for managing the *Harekaze*’s notoriously unreliable machinery, which she protects with childlike devotion. She oversees the engineering department during high-stakes naval maneuvers, maintaining propulsion while voicing frustration at engine strain—yet complying for the crew’s survival. Personality blends a quick temper (especially regarding engine limits) with fierce loyalty and camaraderie. She dislikes solitude and lives by "love thy neighbor." Her interests include festivals, palanquins, fishing, barbecue, and mathematics; she avoids sashimi and English studies. A key relationship is her longstanding friendship with assistant engineer Hiromi Kuroki, beginning in middle school. Maron followed Kuroki to Yokosuka Marine High School to stay together, though tension arose when Kuroki admired Deputy Captain Mashiro Munetani. During the Equator Festival, Maron confessed fears of losing Kuroki’s friendship, leading to reconciliation. Character development includes organizing the Equator Festival to mark crossing the equator. Initial crew apathy shifted when Hime Wazumi’s palanquin project ignited enthusiasm. After the final battle against the *Musashi*, Maron’s desperate attempt to return to the sinking *Harekaze* required Kuroki’s physical restraint, underscoring her bond with ship and crew. These events evolved her role from technical specialist to integral community member. In the 2020 film continuity, she serves aboard the *Harekaze II* during the maritime festival and anti-piracy operations, without new personal arcs documented.