The following are words, concepts and characters you might come across within the story.
Arturia Pendragon:
The Spirit of Arthur Pendragon from "King Arthur and the Legends of the Knights of the Round Table." In Fate/Franchise she is pictured as a young blonde woman with green eyes.
Command Spells:
Three claims of absolute obedience, the crystallization of a great magic, that a Master has over a Servant in the Holy Grail War system.
Core:
The Core that meets various channels of Mana and Magical Energy. It is where the Holy Grail originated.
CRONIX:
Chrono-Revolutionary Organization for Nexus Integration and Experimentation. An Organization that studies what effects Servants, Humans, Homunculi, and Magus can have on each other and if future coexistence is possible; also studying love affairs and relationships.
Elizabeth De Domanica:
The Daughter of Regina and main protagonist. Elizabeth is a Sexologist, second in command of the EXC project and Co-founder of CRONIX.
EXC:
Experiment of Coexistence. A project that sees what effects Servants, Humans, Homunculi, and Magus can have on each other and if future coexistence is possible; also studying love affairs and relationships.
Gawain:
Gawain of the Round Table, also known as the Knight of the Sun. A Noble Knight, the strongest of the Round Table, also Male Lead of this story and love interest of Elizabeth.
Heroic Spirit:
Spirits of heroes who achieved great deeds in life, having become objects of worship after their deaths.
Holy Grail:
The prize of the Holy Grail War, granting a single wish to the victor of the battle royale. However, it is hinted that this Grail is not the real chalice of Christ, but is actually an item of uncertain nature created by mages some generations ago.
Holy Grail War:
A competition that decides the ownership of the Holy Grail through intense battle royale; a war based around Masters, usually proficient Magi, summoning Servants, Heroic Spirits brought forth as Familiars, and meeting in battle until only one pair is left to claim the Holy Grail.
Homunculus:
An existence created through an alchemical method to produce fully functional lifeforms from sperm and other elements without the use of a womb.
Human:
The most prevalent species on the planet.