Mugen Senki Portriss  

In a world where legendary knights emerged, will they become war gods or saviors of humanity? Three Portriss Knights and one human child are now set to alter the course of history. The peaceful existence on Portriss Planet was shattered by the arrival of a tyrannical ruler known as "Dark Portriss". Driven by an insatiable lust for power, Dark Portriss seeks to harness the destructive capabilities of the "Space-time destroying Cannon" to bend the universe to his will. The only hope lies with the Portriss Knights, who must put aside their differences and unite in a battle against tyranny. Meanwhile, an innocent human boy named Yuuma stumbles upon this world and becomes entangled in the adventure that unfolds.