Monsters began to appear all over the world and only the Great Sage, Ichikami Atsumu, could save humanity from the catastrophe known as "The Calamity". Despite being content with his death, Atsumu was reincarnated into the body of Kusanagi Minato, a boy who was relentlessly bullied into committing suicide. Waking up in Japan fifty years into the future, Atsumu discovers a world at peace and where magic has significantly weakened since his time.
As Minato, Atsumu returns to Kamui Magic Academy, but quickly realizes that mages have become antiquated and replaced by a privileged class of nobles. After standing up against his tormentors and catching the eye of the noble magician, Mizuha Yuika, Atsumu gains the support of his fellow students and teachers. However, he also discovers a warning that the Calamity, previously subdued, is impending.
Realizing his power is still needed, Atsumu embraces his role as the Great Sage reborn and sets out to change this peaceful world. Will he be able to prevent the return of the Calamity and become a Hero once again? The journey begins with the reincarnated Great Sage as the protagonist in a new story.
