Due to the frequent occurrence of cruel mutilations, people all over the world are in a state of panic, but the culprit is a "parasitic animal" that human beings did not expect. After invading the human or animal body, the larvae of these parasites target the parasitic brain, assimilate with brain cells and manage the "dead body". They can deform at will, can quickly absorb and master human knowledge, and their food is a species with the same parasites. Shinichi Quan, an ordinary high school student (voiced by Shinichi Shimazaki), was invaded by a strange bug and devoured his right hand one day, and since then he has had to coexist with the parasitic "right". The upright and kind-hearted Quan Shinichi dared not tell his family and friends about the change, but his favorite, Rimi Murano (voiced by coriander), seemed to notice the change in his body. For the sake of relatives and friends killed by parasites and the future of all mankind, Quan Xinyi is determined to fight to the death with all other parasites.
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