Death is caused by something supernatural. Each disease are monsters that come from a different world, the astral world. Killing these monsters will make you immortal. Long ago,before the mortal universe was even created.There existed a world which humans can call "Astral world" 2 Different species battled each other for dominance in that world,1 which later became humanity and the other one who's known as "demons" in todays world. There existed another being other than those 2,someone who's an single entity unlike those 2 species. That single entity holded enough power to wipe out both of those 2 species. Because of how powerful that entity was,humans of that time started to worship that being,unlike the other specie who hated that being. That "Entity" was so pleased with humanity that he used his devine power to create a vast space which we call the "universe" So the earth was created, referred to early humans as "Heaven". Earth was a paradise created just for the humans,the devine entity who's now known as " God" grants every humans in astral world the chance to get to earth. Astral world is a vast infinite space, which mostly surrounds dust and nothing else, it is boring and there's nothing to develop here. The 2 species living on the astral world couldn’t go deep into the astral world, so nobody really knows just what's the secret of the astral world and who's that devine "entity". Humans in early days used to be immortals, but at a certain point humans started to get diseases and death was common. What caused this ?

During the highschool days of walid, he gets involved in a series of murders. The first student who died was walids secret crush onni. Many other students started to go missing and after few days some of them were found dead. All of the deaths were somehow connected, hence police confirmed some serial killer is behind all this. Walid at a certain time accidentally saw the face of the killer and the killer is after him. Walid cannot tell the polic and the killer cannot kill walid.