Before the first chapter, I'm going to introduce the important characters of the story, including those in the harem.
HAREM
Servant: Okita Souji
Class: Saber
Servant: Nero Claudius
Class: Saber
Servant: Meltryllis
Class: AlterEgo
Servant: Hassan of Serenity
Class: Assassin
Servant: Nezha
Class: Lancer
Race: Mage
Master: Gudako/Fujimaru Ritsuka
Servant: Ryougi Shiki
Class: Saber/Assassin
Servant: Ishtar
Class: Archer
Servant: Ereshkigal
Class: Lancer
Servant: Jeanne d'Arc
Class: Ruler
Servant: Atalanta
Class: Archer
Servant: Altria Pendragon
Class: Saber
Other Servants (not in the harem)
Servant: Gilgamesh
Class: Caster
Servant: Enkidu
Class: Lancer
Servant: Merlin
Class: Caster
Servant: Ana
Class: Lancer
Servant: Quetz
Class: Rider
Servant: Gorgon
Class: Avenger
Servant: Jaguar Warrior
Class: Lancer
Demi-Servant: Mash
Class: Shielder