巴司汀的父亲即将再婚,而他与新姐姐妮可又不合;学校里更有个叫奈提司的小鬼帮派老是找他麻烦,为躲避帮派追逐,巴司汀只好躲到图书馆去,发现了一本充满神奇魔幻的故事书──大魔域,他带著书逃到一间秘室,突然消失无踪。帮派头头"斯利"在翻阅这本书后,竟拥有一股神奇力量,从此邪恶势力进驻奇幻王国统御一切……Bastian's dream to get a sibling becomes true when his father re-marries, but soon he has trouble with his new stepsister Nicole and with a gang of school bullies, the Nasties. Hiding in the school library, Bastian finds his favorite book of THE NEVERENDING STORY, where it is later found by Slip, the gang leader. The latter recognizes the power of the book and begins to form Fantasia after his bad intentions. When the chaos becomes worse the Child-like Empress requests Bastian to move back to the real world, get the book back and save Fantasia. Accidentally some Fantasia characters travel with him to reality, but get lost in different places. Meanwhile Slip and the other Nasties spread anarchy. Finally, Bastian gets support from Nicole, who begins to believe in the power of Fantasia.