Obaba, originally named "Koto", is the village chief, the village doctor, and probably the oldest person surviving on Airan — as depicted in the manga and the anime, she had survived since the shipwreck and is probably over 148 years old. Despite her age, she is still quite spry and strong, capable of inflicting physical punishment on the disrespectful or simply intimidating them back in line. While she mostly plays a minor role in the story, there are certain events that revolve around her. She has a descendant Michiru (みちる), who appears in episode twenty-six of the anime for a moment.