fter a war against the Demon Race that spanned nearly a century, humanity finally claimed victory——but it came at the cost of countless lives. Xavier, humanity’s last warrior, drew his final breath filled with regret for failing to save his comrades and burning hatred for the Demon King——or so he thought. But when he opened his eyes, the scene before him was the very day he was born! Gifted with a talent for magic he lacked in his past life, Xavier vows to become a Magic Swordsman, grow stronger, and finally exact his revenge. One day, while training in secret, a twist of fate causes Xavier to fall into the legendary “Abyss.” Waiting for him there was the World Tree, plagued by a mysterious illness, and the Goddess who guarded its roots. Can he unravel the truth of this world and protect his loved ones from the Demon Race? A battle for the future of humanity begins now!