Magu-Chan: God Of Destruction summary:

The God of Destruction Magu Menueku has been summoned by the Chaos Cult. Humanity's last hope is the honorable Holy Knights! The battle to save mankind…took place hundreds of years ago… But now a girl out in the country named Ruru releases the legendary god of destruction who had been trapped in a magical jewel! Will the natto-eating, destruction beam-blasting Magu-chan fill the world with complete chaos? This heart-warming, destructive comedy series is ready to explode onto the scene!