Life prophecy

It's about a man, killed is own mom,dad and little brother. all because, he got out of control. Through the power he stole from the forbidden island zo romeki ground.. Then when he was about to go full rampage.. the villagers prayed and dropped a few blood around just to summon the God manjuko, the god of speed, wind and black mana at that time they both fight with all their strength. Andd they destroyed a lot of towns in the village called munabi! . at last the evil demon king got sealed away for 10,000 years, near mankind's future beginning