The God of Swords is Summoned as a Hero?

The God of Swords, an overbearing existence who had dedicated his entire life to his craft. He stood tall through all the challenges along the way, and emerged a sovereign of the sword. He made the perfect unbeatable sword style, and defeated all of those who dared to pretend themselves as 'above' him. In the end, he reached the pinnacle of his chosen weapon and gained unimaginable power. However, unimaginable power comes with unimaginable boredom. Unable to be defeated, he decides to take a vacation saving another world.