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Hitoshi Iwaaki
Parasyte, Vol. 1
Shinichi Izumi is an ordinary high schooler until a parasitic alien tries to take over his body while he sleeps — and only partially succeeds, ending up lodged in his right hand instead of his brain. Now sharing his body with "Migi," a parasite with its own voice and agenda, Shinichi has to survive in a world where other parasites are quietly replacing people around him, one head at a time.
An ordinary high schooler whose right hand is taken over by an alien parasite, forcing him into an uneasy partnership that gradually changes who he is.
The parasitic alien lodged in Shinichi's right hand, coldly logical and initially indifferent to human life, who forms a wary symbiosis with its host.