Parasyte Vol. 3 (Kodansha, 2015)

Aliens parasites have invaded Earth and taken over the minds of ordinary people. Shin has been infected with a parasite, but he still can think and act for himself. Now he's been approached by two mysterious victims of the invasion: Tamiya, a beautiful schoolteacher, and Shimada, another student. What do the aliens want with humanity… and with Shin?