After leaving school in mid-course, he joined Tatsunoko animation
studio in the mid-1960s, writing scripts for the TV series "Ora Guzura
Dado" (1967-68, a parody of Gojira films) and
The Genie Family (1969) (1969-70).
At the end of the 1960s, he joined Tokyo Movie animation studio and
collaborated in the adaptation of the comedic
Kyojin no hoshi (1969) for theaters.
That was his film debut in 1970, and he made more than a dozen film
scripts until 1994. Also, he worked on more than 30 animation and
live-action TV series. In addition, Itô has written several novels and
scripts for comics, the most popular of them is "Otoko Kuiri" ("Male
Eater"), drawn by Tsuguo Kôgo and converted in two live-action
videofilms in 1996.