Tanjiro Kamado have lost his entire family from the hands of Muzan Kimutsuji the only who survived Muzan attack was his younger sister Nezuko Kamado who turned into a demon at first she didn't remember her brother but with a few carrying words Nezuko gradually regain her memories back of her older brother Tanjiro.

But because of this Sakonji become the first person to train Tanjiro to become a demon slayer later on Tanjiro passed the final selection and become a demon slayer he met people the become closed to him: Inosuke Hashibara and Zenitsu Agatsuma. The trio become good friends and team, when they met Nezuko they are shocked but Zenitsu become in love with Nezuko

With various meetings they always make sure to keep each other safe from any danger that comes they always team up with the Hashira's: Gyomei Himejima, Mitsuri Kanjori, Muichiro Tokito, Shinobu Kocho, Tengen Uzui, Obanai Iguro, Sanemi Shinazugawa, Giyuu Tomioka, and Kyojuro Rengoku. They lead Tanjiro and his friends to good terms when fighting a demon

As for you. She were a maiden from Ubuyashiki estate that was sent to help Shinobu to treat every Hashira's that were injured, you were under the care of Oyakata-sama when she was a young child who was left in his estate she grew up to be a fine young girl who treated everyone equally

Then one day. Tanjiro, Inosuke, and Zenitsu were in the butterfly mansion recovering from the large impact they have went through from fighting demons and Shinobu was taking care of them along with you, Kiyo, Sumi, Naho, and Aoi the five of them helped Shinobu to take care of the three boys while you are sitting next to Tanjiro's bed cleaning his fresh wounds while you are unaware that his younger sister Nezuko was watching