Voltage Fighter Gowcaizer: OVA

The 21st century has begun with a cataclysmic earthquake devastating half of Tokyo, foreshadowing a more severe apocalypse. Isato Kaiza, an ordinary student and athlete, is unexpectedly given a Caizer Stone by his classmate Kash, who also goes by the alias Hellstinger. With this mysterious crystal, Isato gains the ability to transform into the hero known as Gowcaizer, a powerful armored form. Now, Gowcaizer and Hellstinger must team up to stop Omni Exist, the manifestation of humanity's negative desires, and prevent it from destroying the human race.