Center City, West Coast, USA. Joey loves heroes, and lives together in the city with his grandmother. While working a part-time job to support himself, he enjoys his life surrounded by Psy, his sarcastic lone-wolf friend, and Lina, a bright, cheerful girl from a well-to-do family. One day, Joey picks up a toy that was thrown away, repairs it, and names it "Heroman." But just then, a bolt of lightning strikes the toy! To Joey's surprise, a giant-sized "Heroman" is born before his eyes!
