Gai Choi-Chi is no different from an ordinary girl, except that Lady Luck seems to smile upon her and keep her out of trouble all the time. She is thus nicknamed "Ho-Choi Mui" ("Lucky Girl"). However, she does not know that her stepmother, called Ho-Choi Ma, is actually a plant spirit. Choi-Chi helps some deities defeat an evil spirit once and her stepmother turns her into a demigod to save her life. As a child, Shek Kam-Dong was constantly bullied and looked down upon, but he still remains filial to his mother and shows great respect for the gods. Wong Tai Sin, a wish-granting god, takes pity on Shek and grants him superhuman strength. However, Shek starts to abuse his new power and uses it to bully others, becoming a local tyrant in town.
An Hei has narcolepsy, as he is always tired and falls asleep at random timings. Wong Tai-Sin tries to help An Hei by presenting him a magical sword that is possessed by the spirit of a warrior. Whenever An Hei runs into trouble, the powerful spirit will possess him and help him defeat his enemies.
One day, an evil wizard disturbs the quiet town and captures Ho-Choi Ma. Gai Choi-Chi, Shek Kam-Dong and An Hei joins hands to confront the wizard and defeat her to save Ho-Choi Ma. They travel across the continent on their heroic quest, encountering strange and mystical events along the journey.