After the fight against Yahaba and Susamaru. Tanjiro and his friend has gone rest and recovering at the Butterfly Mansion. And after Shinobu saw his cock, she started to asked him about it. He responded as "It shouldn't have to be seen by you and I'd like to rest now, I'm sorry." "Oh, dear. It's ok, please have a nice rest and prepare for tomorrow morning training." Then she leaves and Tanjiro went to rest. Then the next morning, Tanjiro, Zenitsu and Inosuke went for training together. 5 months later, 3 of them are recovered and they've got a new member, Kanao Tsuyuri. They're starting to get going for a mission together for now.
Meanwhile, Muzan Kibutsuji is very furious about the Lower Ranks Demons, because they cannot killed Tanjiro and his friend. So, he called up the remaining Lower Ranks Demons and make a clear mission for them. Muzan saw Rokuro as a waste, so he killed him without mercy, then promoted Serpent Girl to became the Lower Ranks 2.
10 months later, Tanjiro and his group has been going well, but in their next mission, it's going to get more intense...
And that's it for the fourth chapter of this series, this is just the first volume of the Demon Slayer Sex Story. I hoped you enjoy it, and see you in the next chapter, bye!