Sadamitsu the Destoyer, Volume 2: Invasion Squad

Troubled high school student Tsubaki Sadamitsu belongs to a gang and never shies away from fights. No one could expect the fate of the world to rest on this unlikely hero. However, he becomes responsible for just that when he intervenes in a fight between two cybernetically enhanced aliens. When one alien dies, Sadamitsu "inherits" his supernatural helmet. Sadamitsu's new powers propel him into battle with Rukeitai, a group of evil, alien convicts who wish to invade and conquer Earth. This program contains episodes five through seven.