The Holy Grail War of the Ahoges

This was a sudden incident, and no one knew why. Regions from several worlds were connected by a [Holy Grail War]. A Holy Grail War was nothing particularly unusual. The people of these worlds were used to all kinds of strange events. What was truly astonishing was that every participant in this Holy Grail War was Artoria. [Hounds Howl] "Yokohama is becoming independent from the world." "The Port Mafia must protect this city." "The Book has merged with the Holy Grail, so the plan has changed." [Golden Spirit] "Right, Dio has disappeared, and there's a strange woman claiming to be [x]." "Hey, want to try the best bread in Morioh?" "The Stand Arrow and the Boss are both gone. King Arthur, explain yourself." [Sevenfold Sovereignty] "The Dresden Slate is gone. Are you involved...? Please put some clothes on first." "...A bunny girl? What a bizarre outfit." [Return by Death] "The save point has updated this time... Wait, modern society? Hey, hey, this is a big deal! Why are there knightly young beauties here, too?" [Slay Every Demon] "This was originally a world without demons. Lion King, tell me where Muzan Kibutsuji is." [Jackie Chan Adventures] "Uncle, look! There's a giant robot at home!" [The Shrinking Detective] "Impossible, impossible! Does magic really exist in this world?" [Is There Wi-Fi?] "Hey, you like gulping down ice-cold cola too? Umako thinks you have great taste!" Theme: The Ahoge King is number one in the world