Kakugo No Susume

About

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. 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. 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. Some years later, Kakugo moves to "Reverse Cross High School", located in one of the ruined districts of Tokyo near the castle from which Harara commands their demon army. It's now up to Kakugo to defeat his evil sibling and put a stop to their wicked legions.