Ranmaru serves as a retainer to feudal lord Oda Nobunaga, possessing a young, somewhat androgynous appearance marked by long black hair and gray eyes. His personality demonstrates deep loyalty and possible romantic affection for Nobunaga. This dynamic surfaces during their 1579 visit to the Nanban Tradeport, where Ranmaru voices concern over a commotion only for Nobunaga to dismiss it and shift focus to Yasuke. Their bond intensifies during the Honnō-ji Incident of 1582. As the Dark Army attacks the temple, Nobunaga prioritizes Ranmaru's safety above all. Defying historical accounts of Ranmaru's typical fate, Nobunaga secretly orders his evacuation by ship, ensuring Ranmaru's survival while others, including Nobunaga himself, perish. This act underscores their profound personal connection and Nobunaga's protective stance. Ranmaru's narrative arc concludes with this evacuation.