Insect Hashira Shinobu Kocho, Tsuguko Kanao Tsuyuri, and assistants Aoi Kanzaki, Sumi Nakahara, Kiyo Terauchi, and Naho Takada live in Butterfly Mansion (蝶ちょう屋や敷しき) – also known as Butterfly Estate. The house is frequently used to treat injured Demon Slayers.
Shinobu Kocho is in charge of the most of the care at the mansion, but there are other Kakushi who conduct errands and keep an eye on the injured. Other residents of the mansion are not Demon Slayers, but they offer training regimens to help injured Demon Slayers rehabilitate and return to top shape. Aoi Kanzaki, for example, devises a training programme to aid Tanjiro Kamado, Inosuke Hashibira, and Zenitsu Agatsuma in their recovery from their battles on Mount Natagumo.