The parasite invades human society and controls humans by assimilating with the human brain. Due to some accident, the parasite MIGI merges with Shinichi's right hand. Once he survived, Shinichi started a series of desperate struggles with other parasites for the future of mankind. At the end of the film, Shinichi's mother was parasitized by a vengeful parasite and assimilated into a complete parasitic beast. During the fight, at the critical moment when Shinichi was beheaded, the mother's only remaining consciousness, out of motherly love instinct, protected Shinichi. , chose to die. The greatness of maternal love and the power of human willpower.
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