

However, Harara becomes possessed by a mysterious evil from deep within his armor, mutating his body into a far more androgynist one as well as filling him with a desire to destroy all of mankind in order to help cleanse the Earth of contamination. In order to aid them in their quest, Oboro entrusts his two sons with Fortified Armor Shells ( 強化外骨格, Kyōkagaikokkaku), cyborg exoskeletons forged using the souls of deceased warriors by their grandfather, a former scientist of the Imperial Army of Japan during World War II, Shiro Hagakure.

Kakugo and Harara are brothers trained by their father, Oboro, to slay monsters that have begun roaming the streets of a post-apocalyptic, 21st century Tokyo following a devastatingly, powerful earthquake. The manga was adapted into a two episode original video animation in 1996, animated by Ashi Productions and produced by Big West Advertising, Victor Entertainment and Tomy.

It was serialized in Akita Shoten's Weekly Shōnen Champion from July 1994 to August 1996. Apocalypse Zero, known in Japan as Encouragement of Resolve ( 覚悟のススメ, Kakugo no Susume), is a manga series written and illustrated by Takayuki Yamaguchi.
