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Origin Okada was a student of Fujimi High School located in Tokonosu Prefecture, and he was a friend of Kazu Ishii before he was bitten.
The character of Okada is a supporting character of the manga/anime series Highschool of the Dead that was written by Daisuke Sato and illustrated by Shouji Sato. The series first began serialization in Fujimi Shobo's Monthly Dragon Age magazine in July 2006. Okada is a character who has never been shown before his change.
Highschool of the Dead Vol. 1 JPN (2007)
His first appearance was in Hightschool of the Dead Volume 1 CH. 2 "Escape from the Dead", and his first anime appearance was in Highschool of the Dead - Episode 2 "Escape from the Dead". He isn't credited with a voice actor in either the Japanese or English version.
Major Story Arcs
Escape from the Dead
When the Fujimi High School was overrun by Them ( zombies), Okada was one of the many who were bitten and he was brought to see the school's doctor, Shizuka Marikawa. She was unable to help him and he passed away from his injuries. He soon revived as the undead and Kazu Isshi, one of his own friends who was in the nurses office, was forced to attack and kill him off with a piece of medical equipment.