Mount Musubi

 is a mysterious mountain that plays a major role in Hanyō no Yashahime. It is the objective for Towa Higurashi's quest to search for the Dream Butterfly to reclaim her twin sister's dreams and memories.

History
Sometime after returning to the Feudal Era, Towa asked Kohaku for information regarding the whereabouts of the Dream Butterfly. The new chief of the Demon Slayers searched through some texts indicating them inhabiting the mysterious mountain.

Several days later, Towa attempts to search for the mountain on her own. Unfortunately she ends up lost whilst encountering a mysterious man.

Towa later attempts to search for the mountain again, this time accompanied by Setsuna and Kirara. Unfortunately, she only finds a mountain that resembled an onigiri riceball.

Trivia

 * Its name may be inspired by.