Master and company start up the combat simulator for some training. But what appears before them is a castle filled with mischievous—and quite dangerous—obstacles and challenges devised by Sitonai!
"I changed the simulator into a Bounded Field. You have to complete all the challenges to get out, so good luck!"
A minute Singularity that has the potential to kill you... Its name: Illya's Karakuri Castle!
Faced with obstacle courses built under the supervision of an expert in illusions, will Master and their companions be able to overcome each stage of the challenge and safely reach the goal!?
A new kind of competitive festival, crowded with Chaldea's Servants...begins now!
A limited time event in Fate/Grand Order, released on the Japanese server on May 24, 2023, and on the NA server on April 24, 2025.
