Manaka Sajyou, an existence connected to Akasha, is unable to experience phenomenon like change and surprise, so she wishes to attempt to "dream." She sends her consciousness through the Backside of the World, beyond the end of the world, and into different times and different space. During the transfer, she sees dragon waiting for another for a very long time, sees light shining at the end of the world, and ends up in a one-room apartment that seems like the root. After leaving the apartment, she ends up in a labyrinth hosting a variant Holy Grail War featuring four Servants and Masters attempting to reach the bottom. Manaka has possessed the body of a Norma who had summoned a female King Arthur compared to the male Arthur of her world. Saber interacts with Manaka, while Manaka and Norma see each other when looking in a mirror.
- Manaka Sajyou
- Saber's Master
- Norma Goodfellow
- The person summoning Saber when Manaka takes over her body.
- King Arthur
- Robin Hood
- Wolfgang Faustus
It is being serialized during the period between the end of part three of Fate/Prototype: Fragments of Blue and Silver and the beginning of part four.