An unknown force has disrupted the foundations of humanity. Chaldea, which seeks the preservation of humanity, fights to reclaim the future with the help of the Heroic Spirits. However, with powerful threats from both Earth and space alike appearing, the future appears to be swallowed in darkness, but in Chaldea's and humanities' darkest time, a new light rises: Ultraman. OC/Harem.
Crossover - Fate/stay night & Ultraman - Rated: T - English - Hurt/Comfort/Romance - Chapters: 7 - Words: 82,181 - Reviews: 90 - Favs: 69 - Follows: 66 - Updated: 1/17 - Published: 10/23/2017 - [OC, Arturia Pendragon, Jeanne d'Arc, Mashu/Shielder]