Izure Shinwa no Ragnarok  

A Ragnarok to be a Mythology, いづれ神話の放課後戦争〈ラグナロク〉

Previously, seven legendary gods descended upon Earth and their conflict caused the planet to split apart and shattered the sky. Ten years have passed since then, but the aftermath of the battle still lingers. A young boy named Shinsen Raika lost his true sister during the war and is currently studying at an academy on a remote island in the far seas. At night, this academy is known as "after school time," and it's during these hours that the "Gods Proxy Wars" take place. These wars are fought by using Divinity-Compatible individuals to gain control of the world's supreme law. On the first night of these proxy battles, Raika was attacked by Brynhildr, a Norse mythological god. Facing certain death, he gained the power of gods and the ability for revenge. With the Absolute Domination power from Balor's devil eye, Raika vowed to reclaim control of the world from the gods. A new epic saga of a devil eye-user hero begins now as Raika sets out on his quest for vengeance against the gods.