Section0: Prologue of Devastating War

Kamen Rider and Kamen Rider Saber is owned by Toei and Shotaro Ishinamori, please support the original release. Fate/Grand Order and it's characters are owned by Type-moon and Aniplex, please support the original release of that confusion of a series.

Knights, Heroes, Wizards, Monsters, Beasts, all of these have one thing in common: Stories. The stories of great Kings, Legends of Heroes with lots of achievements, Gods of Mythology, Monsters and Beasts that go down through history have gone throughout the world. Those pieces of information all entertain people to become legends of their own, such is a case for Riku Amamiya. A 19 year old boy who has dreams of a magical land and lives in a bookstore that his father owns. Riku works in this bookstore along with his father, who had to retire due to old age and allowed Riku to own the store that continues to get customers. One day, Riku meets 3 strange people, their names are; Gudao and Gudako Fujimaru and their friend Mash Kyrielight and they are in town to look for something important. Soon, Riku finds himself joining the 3 as he is brought into a conflict called the "Holy Grail War" that allows Magus's to fight against each other with servants of past heroes. If that wasn't bad enough, the town is also attacked by monsters from a dangerous group, called the Megiddo, who try to take the Holy Grail for themselves. Riku decides to join the 3 mysterious people as he becomes the Flame Swordsman of a mysterious world called "Kamen Rider Saber"! Now, the journey to save his town has begun and Riku will be the one to decide the ending of the story.