A fantasy adventure series about an alternate dimension known as the Land of Wonders. The boy Paul receives a seemingly ordinary stuffed toy as a birthday present. The present, named Pakkun, is actually a sentient toy in the form of a dog. Pakkun is the guardian of the portal between the two worlds. Paul and his best friend Nina cross the portal and starts exploring the other universe. The young girl is kidnapped by the demonic ruler Belt Satan. Determined to rescue Nina, Paul fights Satan's monsters with his powerful yo-yo while trying to reach her new location.