Demon Slayer is a very popular anime. It is also tradition to go visit the real world places where the anime is located in.
Demon Slayer’s Mt. Kumotori is not one of those places you want to visit unprepared, as the Okutama Visitor Center has issued a warning that “Mount Kumotori is not a mountain that can be climbed easily. Even experienced climbers can take 6 to 7 hours to reach the summit one way. For beginners that may take more than 10 hours.”
Please heed the warning and do not go unless you know what you are doing and are well equipped.