Neon Starts with Assembling the Demon King

Sato Ryoma, who was reborn in Nara, Japan, accidentally awakened the golden finger that can swallow demons and transform them into incarnations. "Ah, yes, Niu Gui's right arm." "Hey, the wine will swallow the boy's head!" "Ah, and Tamamo-mae's tail!" "Hey, there's also Su Nuo's Y-shaped spine." It's obvious that he has gained the power of the Demon King, but why are they all body parts? Many years later, he sat on the Bone Throne, looking down at all living beings. "Hahaha! I don't need anything anymore." - Dad's voice.