Kiseijuu Wiki
Kiseijuu Wiki
Kazuyuki Izumi
Personal statistics
Name Kazuyuki Izumi
Japanese 泉一之
Rōmaji Izumi Kazuyuki
Gender Male
Age 44
Status Alive
Relatives, etc. Nobuko Izumi (Wife - Deceased)
Shinichi Izumi (Son)
Unnamed Brother
Species Human
Eye Black
Hair Black
Occupation Magazine writer (formerly)
Series statistics
Anime debut Episode 1
Manga debut Chapter 1
Seiyuu Masaki Aizawa
English Voice Rob Mungle
Image Gallery

Kazuyuki Izumi (泉一之, lit. Izumi Kazuyuki) is the husband of Nobuko Izumi and the father of Shinichi Izumi. He is a former magazine writer, now freelance. 


Kazuyuki is a tall middle-aged man with a mustache and black hair that he keeps combed. He's normally seen wearing a brown button up vest over a green long sleeved shirt and blue jeans.


In the beginning, Kazuyuki is a rather laid-back person, seeming to go with the flow with any changes he notices that take place in Shinichi. He was not above poking fun at Shinichi's fear of bugs and expressed some confusion and exasperation at Nobuku's sensitivity about their son's changes.

Later on, however, after she dies, he becomes depressed and develops a drinking problem. He does eventually open up to Shinichi about Nobuko's fate, though he initially shows negative feelings for Shinichi's ability to keep moving after her death.


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Kazuyuki is first seen late at night, entering his son's room along with his wife after hearing strange noises. After witnessing his son on the floor with a cord wrapped around his arm, he asks what he's doing. Shinichi quickly tells him of the '"snake" that jumped into his arm, and goes to show him the hole left from it. With no hole or any noticeable injury, Kazuyuki asks Shinichi if he's on drugs, something Shinichi denies and Nobuko laughs at.


  • The name Kazuyuki means "one" (一) (kazu) and "to go" (之) (yuki).
  • His surname Izumi means "spring, fountain" (泉).
  • Kazuyuki was omitted from the live action movie.
  • He is a main character in one of the Neo Parasyte F stories, A New One.