Masaru Aso was the lab assistant of geneticist Doctor Mochizuki, used as one of his experiments related the creation of the Neo Organism, enabling him to transform into a grasshopper-like being called Kamen Rider ZO. He fled into the mountainside and went into a coma before he was awakened by a telepathic call two years later with an unconscious urge to protect Hiroshi Mochizuki, the son of Doctor Mochizuki.

A hard working salaryman takes off five days from his busy job and sets off with his wife and two children to visit his parents in his hometown for the 1991 new year holidays. He decides that they will go by car to save on expenses. Unfortunately, the long drive from Tokyo to his hometown becomes a much longer journey than expected due to traffic, sickness and other misfortunes and by the time they arrive three days later, they only have time for a short but happy visit.

Based on the beloved book, the polar bear cub Lars floats away on a patch of ice and ends up in Africa, where, with the help of his new friends, he finds a way back home to his papa at the North Pole.