The Butterfly is the manor that Shinobu Kocho, her student Kanao Tsuyuri, Aoi Kanzaki, Sumi Nakahara, Kiyo Terauchi, and Naho Takada live in. Shinobu displays immense skill and mastery in over medical and pharmaceutical fields and is a very powerful and skilled demon slayer, with teleporting speed, immense reflexes, stamina and endurance. The Demon Slayers who have awakened their mark are said to, without exception, die before reaching the age of 25, and she wants to help you with that.