Kuki-sama, a benevolent demon manifesting in human form, sustains the flying battleship Amanohara's flight capability through her spiritual powers. Maintaining this function requires her to periodically engage in intimate encounters with Shintaro Umakai to recharge these essential energies. Three shikigami familiars, appearing as young girls named Koushi, Soushi, and Oushi, assist her in her duties aboard the vessel; these familiars originated in the anime adaptation before being incorporated into the PlayStation 2 version of the source material.

During the events of the OVA *The South Island Dream Romantic Adventure*, the Amanohara suffers significant damage, forcing a temporary landing on an island for repairs. Kuki-sama departs the ship during this repair period but remains connected to the crew's activities. Her direct involvement in the island's local festival and specific repair efforts is not detailed beyond this absence and subsequent return. Kuki-sama possesses grey hair and red eyes. Her role is consistently defined by enabling the Amanohara's flight via her spiritual powers and the associated maintenance requirements.