The Holy Grail War faces a grave threat.
In front of the familiars that have gathered at Fuyuki Church, Risei expresses his intent to temporarily suspend hostilities in order to put down Ryunosuke Uryu, the perpetrator of the recent string of kidnappings and murders, as well as Caster, his Servant.
In addition, the Master who eliminates him will receive a Command Seal from a previous Grail War that had not been used as a reward.