Name the anime please!?

Plot: This guy wakes up in his past in a world where its normal to kill monsters for money. Somehow he still retains all his future fighting skill. He has this cute little monster pet that is incredibly strong and easily destroys and consumes these monsters. He needs money so he kills a giant snake creature with this sacred dagger found in his house but these guys try and steal his kill, so he kills them and then sells the bodies back to their families but then this fog of monsters appears and everyone run except him and he fights them. These stones come out the monster and his pet consumes them and gathers power from them.

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