Disregard for alchemy’s laws ripped half of Edward Elric’s limbs from his body and left his brother Alphonse’s soul clinging to a suit of armor. To restore what was lost, the brothers seek the Philosopher’s Stone. Enemies and allies – the corrupt military, the Homunculi, and foreign alchemists – will alter the Elric brothers course, but their purpose will remain unchanged and their bond unbreakable.

Two young brothers are raised as alchemists, but when they are severely injured trying to perform a forbidden act, they begin searching for the one thing that can save them; the fabled philosopher's stone.

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

Eiji Hino is a wanderer who has no place to call home and a tragic past. When metallic creatures known as the Greeed awaken after their 800-year slumber to attack humans and feed off of their desires, the disembodied arm of the Greeed named Ankh gives Eiji a belt and three Medals to fight the other Greeed as Kamen Rider OOO. The mysterious Kougami Foundation approaches Eiji and begins assisting him in his fight against the Greeed, though their true motives are not clear. As Eiji fights the Greeed and their Yummy monsters, learning more about the Greeed and Ankh, he starts to find a purpose beyond his journey.