Enonoka is a young Karafuto Ainu girl who joins the narrative during the journey into the Sakhalin region. Her name is derived from the Ainu word for lingonberry, a name she received after consuming a large quantity of the fruit and becoming ill as a result. In terms of appearance, she is a small child with large, dark eyes and shoulder-length dark hair. She traditionally wears an Ainu cap along with customary Ainu clothing, complemented by mittens and woolen boots. A makiri, a type of knife, is typically secured on her left side.

Enonoka lives with her grandfather, who often serves as a sled driver and guide for other characters. Her personality shows a notable resilience and a distinct sense of amusement, as she appears entertained by daredevil or dangerous occurrences rather than expressing nervousness. This is evident when she eagerly shouts for a character to proceed with a dangerous act like self-inflicted injury while others in the crowd show anxiety. She is also capable of deep emotional sensitivity, shedding tears when hearing tragic stories from others.

Enonoka primarily serves as a local guide and companion for the main characters when they venture into the Karafuto territory, her homeland. She forms a particularly close bond with Cikapasi, another young Ainu child near her age. She demonstrates her care for him by granting him a hohciri, an ornamental headpiece traditionally worn by Karafuto Ainu boys until the age of ten, which had originally belonged to her father. She explains that Cikapasi will only be able to remove the ornament once he successfully defeats a wolverine by himself. Enonoka is also present for many key events in the Karafuto region, including performances at a circus, navigating severe blizzards, and encounters with dangerous wildlife such as wolverines and an Amur tiger.

Throughout her journey with the group, Enonoka helps with essential tasks such as translating stories and legends from her grandfather's Ainu into information the others can understand. She is observant of the group's dynamics and occasionally corrects misunderstandings, such as when she clarifies that a provided dish is medicine rather than additional food. Her development is subtle but significant; she transitions from a child who requires protection during dangerous encounters to a more composed presence who is trusted to handle dogsleds and contribute to the group's survival. She also provides cultural insight into the traditions of the Karafuto Ainu, including their summer homes and customs regarding childrearing and hunting rites of passage.