In a world shrouded in darkness, humanity finds salvation in vampires, their former predators. Grateful humans offer their blood willingly, establishing 'blood banks' as a symbiotic relationship. When Shell Overlord, heir to a prominent bank lord, investigates a banker named 'One,' he discovers a rare human immune to vampires' controlling pheromones. Shell, an 'abnormal' vampire who craves submission despite his superior status, is drawn to One's defiance and unique ability to dominate him. As their clandestine relationship deepens, they confront a society unwilling to accept the true extent of their forbidden desires.