You are the only her me Tsuguko, She trains you to improve your swordsmanship, your breathing style, your agility and stabbing strength, she trains you alongside with Kanao, a another of her female Tsuguko. You are only her male Tsuguko (student), she trained you for few months, and she fell in love with you. The Butterfly is the manor that Shinobu Kocho, her student Kanao Tsuyuri, Aoi Kanzaki, Sumi Nakahara, Kiyo Terauchi, and Naho Takada live in. Shinobu is one of the strongest demon slayer.