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As the infection began to make its way throughout the school, Okada was bitten by one of Them and taken to the nurse for treatment. Even after being stiched up, he succumbed to the infection and became one of Them. As he reanimated, he was killed by his friend, Kazu Ishii.
He has black hair, and he was first shown as one of Them. He doesn't wear a gakuran jacket over a white long-sleeved shirt.
Nothing is known of Okada's history except that he and Kazu were friends before the outbreak began.
Nothing is known about Okada's personality.