Zenitsu had not spoken ever since the death of his grandfather, and was diagnosed with psychogenic mutism. Due to him not being able to speak, he is constantly bullied and ignored by his peers. This caused Zenitsu to have no self esteem and became a loner that every class seemed to have. After he graduated from his previous school, he managed to get into Kimetsu No Yaiba High School, which he assumed that school life is going to be the same bullying routine as his previous school. However, his daily routine was quickly shattered when a certain blue haired boy claims to have taken his seat. Before anything bad could happen, he was saved by a brunet with red ends. The brunet claims not to be Gonpachirou, but to be Tanjiro Kamado...?

~~What is happening? Why am I so cold? Am I dead? Wait... A voice? "I see you're still holding on. But just barely. Would you like to make a deal?"~~ Kurai Sayaki is an 18 year old boy living in Japan. He was like any other boy until a fateful encounter cost him his life. He didn't know why, but he woke up the next day in a hospital bed, looking as if nothing had happened to him. He then finds out that he had made a deal. A deal with the devil's son. Now he has to work as a slave for the son in exchange for his life. Not just that, the sons seem to be fighting over him for some reason and he doesn't know why. Will the relationship he has with the devil's son become more than just master and slave? Or is he doomed to be nothing more than a demon's pet for all eternity? ~~WARNING! Contains vulgar language, christian type stuff, and sex. Do NOT read if you don't like that and feel offended. Also, I'm sorry to say that it doesn't have much yaoi in the beginning chapters but there will be some sex scenes. Enjoy reading!~~