"There's no way that I will let everyone die again!"
This is the story of Arthur Falmas. 
One of the last one hundred people who survived the battle with Cryzsalis Mimon - The dragon who seeks to destroy the world.
They tried to save what's left of the world by battling and defeating the evil dragon but they tragically failed, and as for the result - the world ended.
Arthur thought he had met his demise, but to his surprise... he went back 18 years to the past when the world was still well and full of life.
He still has three years to prepare before the apocalypse starts again.
He needs to change the outcome of the future by gathering powerful comrades.
He needs to save humanity this time.