Shota, the human owner of the titular dog Charo, discovered the newborn puppy abandoned in a snowy park and rescued him. This act established their foundational bond, with Shota becoming Charo's primary caregiver and providing a home in Japan. When Charo becomes accidentally separated and stranded in New York City, Shota remains in Japan throughout the absence. He functions as Charo's emotional anchor and motivating goal, driving the dog's determined journey to reunite with him.