The story follows protagonist Tanjiro Kamado and Nezuko Kamado as he seek for a solution to turn back Nezuko back into Human from Demon. His family........................... While he was out to sell coals to the nearby village, his family was attacked and slaughtered by a demon. By the time he arrives, he finds all his family dead and torn into flesh but apparently his young sister Nezuko was still breathing. Tanjiro rushes towards the nearest town carrying Nezuko to get some medical help, in the midst of snowy mountain Nezuko turns into a Bloodthirsty Demon and the crash into a Demon Slayer(a secret society of samurai group, who are dedicated to slay Demon for centuries). The Demon Slayer tries to kill Nezuko but his brother tries to protect her, failed by his desperate attempt to save his sister gets knock-down in the ground. Seeing this Nezuko rushes to protect his brother even though newly formed Demon needs energy and with all the fighting she was definitely exhausted. [Demons only source of gaining energy is feeding on Human flesh]. She didn't try to eat her brother even in the dire situation. By displaying the signs of human emotion and thought, even though being fully transformed into a Demon, the Demon Slayer (named '' Gyuu Tomiyoka") lets her free and advises Tanjiro to join the Demon Slayer Corps to find some clue to cure Nezuko's Demon curse. He trains from the former water Hashira(one of the nine most powerful swordmasters in the Demon Slayer Corps) and finally join the Demon Slayer Corps after passing the entrance test. starting from lower ranks completing missions from headquarters on the way he meets two more subordinates named Zenitsu and Inosuke. Zenitsu has a sissy and annoying character but having an extreme sense of hearing but becomes immensely powerful when he is unconscious( sleep). Whereas "Inosuke" grown in the mountains who claims that he was trained by wild boars of the mountains, having Beast sense( Able to sense things with skin) and a meathead like character but having a soft side inside. The story continues as the three along with Tanjiro's sister, continues on a journey for the treatment of Nezuko.