In a society where the government rules with an iron fist, a rebellion named the Underworld stepped up to fight against their wrongdoings. After months of raiding, the Underworld found the government's darkest secret; Parasytes. These parasites, dubbed Parasytes, after latching on to a capable host grant the host superhuman-like abilities, though the threat of them completely taking over is a constant possibility. Duoed with these parasytes, the fight against the government began to reach a crescendo, however, with the government endorsing elite superhuman teams of their own and parasyte savvy tech, the battle is yet to be won. Follow Alard, whose family fell victim to the government's system as he seeks vengeance. Will he survive merging with a rare parasyte and end the government's tyranny as an agent of the Underworld? Only one way to find out.