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Demoted to a Teacher the Strongest Sage Raises an Unbeatable Class manga,Sasen Sareta Saikyou Kenja, Kyoushi ni Natte Muteki no Class wo Tsukuriageru ,The Strongest Sage Was Demoted and Became a Teacher, Creating Unparalleled ClassesMonsters have lon

If you become a hero and defeat the Demon King, a life of idleness awaits you...! This is what the young man Jirei believed, and he worked hard day and night to achieve his goal. However, when he found out that the heroes who defeated the Demon King