A stone-cold classic! Highest Travelling Man recommendation!

The humans are ready for war, and they're bringing everything they've got-including a dangerous “psychic” killer who can identify parasites on sight but whose own capacity for bloodshed is just as monstrous. Shinichi cooperates, but he's struggling to keep his parasite arm a secret from the humans around him. As the sting operation at City Hall turns even more gruesome, Shinichi finds himself once again in the crosshairs of a powerful enemy...