A mysterious alchemist studies and experiments to create “living creatures” called Chemies. Unfortunately, the cards that should have been kept secret are accidentally unleashed on the world. High school student Hotaro Ichinose is tasked to retrieve all the Chemie released around the world. Using the Grasshopper Chemie, Hopper 1, and Steam Locomotive Chemie, Steamliner, he transforms into Kamen Rider Gotchard!