In episode 10 of Kimetsu no Yaiba, titled "Together Forever," Tanjiro and his friends find themselves facing off against the formidable Lower Moon Six, Enmu, who has taken over a steam train and is preying on its passengers. Using his dream-manipulating abilities, Enmu traps the demon slayers in a deep sleep, forcing them to confront their deepest fears and desires.
As the sun rises over the horizon, Tanjiro and his friends stand victorious, their bond stronger than ever. Though their journey is far from over, they know that as long as they have each other, they can face any challenge that comes their way in their quest to rid the world of demons and find a cure for Nezuko.
As Tanjiro struggles to break free from Enmu's dream world, he must rely on his unwavering determination and the bond he shares with Nezuko to overcome the demon's illusions. Meanwhile, Zenitsu and Inosuke must also find a way to wake up and join the fight before Enmu consumes everyone on board.
When Tanjiro returned the next morning, he found his family slaughtered, except for his sister Nezuko, who had been turned into a demon. Overwhelmed by grief and a burning desire for revenge, Tanjiro vowed to find a way to turn Nezuko back into a human and hunt down the demon responsible for his family's death.