When Kibutsuji Muzan appeared before the Master, the Master knew his own demise was approaching, so he planned to commit suicide along with the mansion (including his wife and children).
The suicide bombing left Muzan seriously injured, and the Pillars who had gathered for Pillar training and the Demon Slayer Corps, including Tanjiro, quickly gathered around Muzan.
The moment they gathered, the ground suddenly transformed into the entrance to the Infinity Castle.
The Demon Slayer Corps, including the Pillars, then set foot inside the Infinity Castle, and the final battle unfolded.
This time, we’ve put together a summary of where the Infinity Castle is and how to enter.
What is the Infinity Castle in Demon Slayer?
Mugen Castle is an alternate dimension castle created by the powers of Nakime, a demon created by Kibutsuji Muzan.
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Nakime is a female demon who appears in the first episode of the Swordsmith Village arc, hiding her face with her hair.
This is the demon that Akaza called “Biwa Woman” and Douma referred to as “Biwa no Kimi.”
How do you enter and exit Demon Slayer’s Infinity Castle?
Following Muzan’s orders, Nakime is in charge of managing the entrance and exit to Mugen Castle.
In other words, the way the Demon Slayer Corps entered the Infinity Castle was through a direct invitation from Muzan.
Shortly before that, Nakime had manifested her marking ability and used something like a “GPS tracking tag” in the real world.
Muzan used that ability to secretly monitor the members of the Demon Slayer Corps, tagging many of them.
Then one night, he sent out a simultaneous invitation, attempting to wipe out the Demon Slayer Corps, including the Ubuyashiki family.
His main purpose was to capture Nezuko.
Are there no entrances or exits to the Infinite Castle?
Mugen Castle has no clear entrances or exits.
The castle was constructed in a different dimension by Nakime, and this is explained in the fan book.
For example, Enmu suddenly appears after a power harassment meeting.
At that time, a shoji door forms in the space through which he appears.
This means that Mugen Castle is not an actual space that is connected to the land.
How do I enter and exit Mugen Castle?
People enter and leave the Mugen Castle by having Nakime play the biwa.
With this operation, Nakime calls in anyone she wants to bring inside, wherever they are, and sends out anyone she wants to leave to a location of her choice.
Therefore, it is impossible for the Demon Slayer Corps to enter the castle unless Nakime intends to “let these people into the castle.”
Nakime is fundamentally loyal to Muzan, so unless Muzan intends to invite the Demon Slayer Corps into the castle, there is no chance of them entering the castle.
Almost disappeared due to Nakime’s death？
During the final battle, the castle began to collapse and emerge from the ground, due to Yushiro’s manipulations.
However, this does not mean that the castle was located underground.
At that time, Nakime, the psychic, had died, and the Mugen Castle was on the verge of disappearing spatially.
How did you get out of Infinity Castle?
They were able to escape from Mugen Castle by being transported underground by Yushiro.
If things continued as they were, aside from Muzan, there was a high chance that the Demon Slayer Corps within the castle would all be wiped out in the other dimension.
So Yushiro desperately moved the survivors and Muzan to their real locations.
When moving so many people, Yushiro did not have the luxury of choosing the location, which led to the coordinate axis being thrown off, and they ended up appearing slightly underground.
This is why the location was slightly off from what the Ubuyashiki family had predicted.
summary
Thank you for reading “What is the Infinity Castle in Demon Slayer? How do you get in and where are the entrances and exits?” to the end.
Mugen Castle is the base of Kibutsuji Muzan, and is an alternate dimension created by Nakime, who would later become one of the Upper Rank demons, using her Blood Demon Art.
The sound of Nakime’s biwa (Japanese lute) changes the space, structure, and terrain within the castle as if they were living things.
Inside the castle, space is distorted, disrupting the concepts of up, down, left, right, and gravity, and the sliding doors, tatami mats, floors, and walls of the Japanese-style rooms are connected in absurd ways that defy the laws of physics.
This strange space is not limited to Japanese-style rooms; there is also a hall reminiscent of a Western-style restaurant with the world upside down.
There is even a room where demons like Douma have their own individual gardens.
The existence of this variety of rooms shows how the interior of Mugen Castle can change in all its forms.
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