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: The protagonist, a legendary hero named August , is annihilated along with his party during a battle against the Demon King. He is reincarnated in modern Japan as a boy named Isami , eventually regaining his memories of his past life as a child. Sensing that the Demon King is also plotting a return, Isami enters high school and establishes a "Hero Club" to find his former comrades and prepare for a future battle—all while trying to navigate the mundane rules of a typical Japanese school.

and Piccoma : Additional platforms for digital reading. : The protagonist, a legendary hero named August

You can find official chapters (in Japanese) and purchase volumes through these platforms: : The protagonist