The Kaleidoscope: the essence of Second Magic, containing within it countless parallel worlds. A place where all possible realities exist, where fantasy meets reality. Worlds of Holy Grails, of Masters and Servants...and Riders.
Two and a half years ago, he awoke without any memories except one: his name. Now, he has to embark on a journey after the destruction of the world. With few allies and 19 worlds' worth of enemies, Fujimaru Ritsuka has to travel through the Rider Worlds to understand the meaning of his journey and figure out the greatest enemy waiting at the end of everyone's story.