DEMON SLAYER : Kimetsu No Yaiba episode 5 explaination

 Bright red sword

     

Muichir Tokit asks the Kanamori for a sword after saving the infant and him at the beginning of the episode because his own sword was somewhat damaged. And the saved youngster argues that if Haganezuka is being harassed by demons, we must assist him. then they travel to the community. While they are travelling to the village, Tokito feel the presence of a demon. The upper five has little hands on his head. Tokit Muichir are fighting the monster.  When Mitsuri Kanroji [Love Hashira] came in the village, she exterminated every monster and helped the locals. The upper four demons were then engaged in combat with Tanjiro and Nezuko.Then back to Tokito fight demons then attacked the infant and Kanamori, but Muichir Tokit  managed to save them. 

But when the demon dealt Tokito significant injury, it imprisoned him in a water bubble from which he was unable to free himself. The action then shifts back to Tanjiro and Nezuko fighting demons, after which Nezuko uses her blood to set Tanjiro's blade fire. Tanjiro's black sword then becomes red and reveals his inherited memories. During a combat, a female spoke to him about  samurai swords changed colours. Returning to the battle, Tanjiro used the Hinokami Kagura Sun Halo Dragon and Head Dance to exterminate all four of the upper demons who were afraid of him due of the sword. When Genya Shinazugawa kills a demon, but in a twist, Genya Shinazugawa transforms into a demon. 

episode 5 ended