An adorable gray and white kitten with black stripes wanders away from her mother and siblings one day while enjoying a walk outside with her family. Lost in her surroundings, the kitten struggles to find her family and instead is found by a young boy, Youhei, and his mother. They take the kitten home, but as pets are not allowed in their housing complex, they try to find her a new home. This proves to be difficult, and the family decides to keep the kitten. While being housebroken, the kitten mistakenly answers to "Chi" (as in "shi" from shikko, the Japanese word for "urine", as seen in the animation and manga when the main character goes "pee") and this becomes her name. Chi then has a splendid time living with her new family, learning about different things and meeting new people and animals.