The group consists of four young animal characters: Seitaro Usagi the rabbit, Risu the squirrel, Kuma the bear, and Penguin the penguin (their initials form U-Ri-Ku-Pen). They belong to a courageous team of young animals dedicated to rescuing those in danger. Additional members include a dog, a boar, a deer, a koala, a mouse, a seagull, and a lion. Upon completing a mission, the animals receive a prize, and viewers are also rewarded. Viewers are asked to send in letters guessing which creature will save the world by each Friday, as a single mission spans an entire week of television. The series was created by Mitsuru Kaneko and had a limited broadcast on some American local TV stations catering to the Japanese community.