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Toshiaki Nagashima
Toshiaki
Toshiaki in the film adaptation
Gender
Male
Age
Adult
Status
Deceased
Hair color
Black
Eye color
Brown
Occupation
University professor and scientist
Appearances
Parasite Eve
Portrayal
Hiroshi Mikami

Toshiaki Nagashima (永島利明 Nagashima Toshiaki) is a university professor who specializes in the subject of mitochondrial research. He can be considered the protagonist of the novel.

Parasite Eve

At the start of the novel, his wife, Kiyomi Nagashima, is rendered braindead due to a mysterious car crash. He starts to lose his sanity, as well as feels infrequent outbursts of heat. Toshiaki is ultimately forced to euthanize Kiyomi as a result.

He later find out that his wife has registered herself on the organ donor list, and bribes the doctor to give him his wife's liver in exchange allowing the doctor to use his wife's kidney to be transplanted into a patient. He then cultures the liver cells to feel that he is reviving his wife labeling them Eve, and makes unusual discoveries with his student, seeing that the cells are dividing at a rate more rapid than normal cells, he publishes a report on nature with his student, when the turning point of the novel starts. The cells are discovered to be the dispersed form of a life form plans to take over the planet as the dominant species and overthrow all other life forms, by birthing the "perfect being."

Toshiaki is manipulated to give a semen sample to the cells which has taken on the form of his wife. Toshiaki, along with the doctor, tries to stop Eve before it's too late. Eve eventually births the ultimate being but makes a fatal error in that Toshiaki's sperm carries a line of male mitochondria which will be exterminated should the perfect life from came to being. The offspring then suffers a rebellion within its own body. Toshiaki kills himself with the ultimate being to stop the powerful outburst from harming civilians. Toshiaki meets his demise peacefully trying to touch Mariko, seeing her as the last remains of his beloved wife: a wish Mariko's father grants after his death.

At the end of the novel, Toshiaki's student discovers more samples of liver cells, but destroys them.

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