Since ancient times, stories have circulated among people about mysterious entities. The Snake, the Centipede, the Toad, the Lizard, and the Scorpion. These five beings, known as the Five Venoms (O-dok), are monsters living in human form.

Their world follows a simple yet cruel order: the stronger venom survives. It is their natural way of life to be wary of one another, sometimes devouring each other to prove their strength. However, not all of the Five Venoms walk the same path. Some view humans merely as prey, while others begin to obsess over a specific human for no apparent reason. Whether it is emotion or instinct remains unknown, but once entangled, the bond is never easily broken.