Infinity: Until the End

"Don't come here. If you come here again, I'll kill him!" The demon raised the human shield man with his left paw, and the sharp claws continued to shrink, leaving traces of blood on the man's neck. "It was him you tied up, but it was me you threatened." "What, he is my son?" The writing style is similar to the above, unlimited writing, traveling through the world of missions, and the protagonist has a bit of a venomous tongue.