Fate/stay night Unlimited Swordsman

The Holy Grail is a legendary treasure that can fulfill all wishes of the holder. The ritual to obtain the Holy Grail is called the Holy Grail War. The seven magicians selected by the Holy Grail who participated in the Holy Grail War were called Masters, and they made contracts with seven familiars called Servants. They are the seven heroic spirits selected by the Holy Grail, divided into seven classes, and summoned as familiars. Only one group can obtain the Holy Grail, and each of these seven groups kills each other in order to become the last group. Emiya Kiritsugu's adopted son Emiya Shirou accidentally made a contract with the swordsman Saber (セイバー) among the servants, and was involved in the Holy Grail War...