Fate/stay night prequel season 2

The legendary treasure that can fulfill all the wishes of the holder - the Holy Grail. 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 (Masters in English), and they made a contract with seven familiars called Servants (Servants in English). They are the seven heroic spirits selected by the Holy Grail, divided into seven classes, and summoned as familiars. There is only one recognized user of the Holy Grail. The Master must make a contract with one of the seven professional Servants to prove that he is qualified to possess the Holy Grail.