Koma is a white cat with black markings on her head and pink ears, and she is one of the central animal characters in the series. She lives at the Matsunoyu public bathhouse, which is run by her owner, an elderly woman named Yuzuko Oketani. Koma often greets customers at the bathhouse, enjoys bathing herself, and sometimes plays with toys from the establishment. As the youngest member of the group of neighborhood cats and dogs, she has a tomboyish and energetic personality, yet she is also deeply affectionate and acts as a little sister figure to the older animals. Her curiosity and playful nature frequently lead her to join the adventures of the group, and she is motivated by a desire to be included and to explore the world around her. She also holds a secret crush on Nora, a stray cat, which occasionally influences her actions. In the story, Koma is a main character who contributes to the heartwarming and lighthearted episodes that depict the daily lives of the animals on Third Street. Her relationships with the other animals are marked by mutual fondness; they treat her protectively, while she looks up to them and cherishes their company. Although the series maintains a gentle atmosphere, Koma occasionally shows small signs of growing confidence and independence, though her fundamental traits remain consistent. She exhibits typical feline agility and curiosity, but her unusual comfort in water and her thorough knowledge of the bathhouse setting are notable traits that distinguish her within the group.