The anime was released as a three-volume OVA, with each volume containing four episodes: the first volume, "1st Season," was released on August 14, 2011; the second volume, "2nd Season," on October 28, 2011; and the third volume, "3rd Season," on December 31, 2011, for a total of 12 episodes. In addition, "EX Season" was included as an OAD in the "TAKEMOON Eri Takenashi TYPE-MOON Art Collection Special Edition" released on November 26, 2011, while "Special Season" was included in the BD BOX "TYPE-MOON Fes. -10TH ANNIVERSARY EVENT-," released on January 16, 2013, which contains the TYPE-MOON 10th anniversary event. In a bar run by cats, a group of cats is talking. Their conversation hints that a frenzied, violent feast that may break the boundaries between time and space is about to arrive. Fuyuki City once again holds the "Holy Grail War," which drives magi mad. Shirou Emiya, Saber, Rin Tohsaka, Archer, Souichirou Kuzuki, Rider, and others form different teams, all determined to claim the Holy Grail. Unexpectedly, however, this time the victor must instead be decided through games such as tennis, hanafuda, card drawing, and Blackbeard. Just as all the participants are exhausted from the games, the Holy Grail suddenly appears before everyone. Shirou Emiya, who hates the Holy Grail intensely, decides to destroy it with a projected weapon. Unexpectedly, from the split Holy Grail emerges Neco-Arc, who did not originally belong to this time and space! With Neco-Arc's arrival, a battle that entangles magi from different dimensions inevitably and formally begins.
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