The Hidden Power Under the Stage: After Defeating the Demon Lord and Rejuvenating, I’ll Support the Academy from the Shadows

The legendary hero Sakuya and his party are ambushed by the great demon Ashtarte's overwhelming power, but the warrior monk turns the tide using an ancient stone tablet technique to defeat the Demon Lord. Yet instead of glory, Sakuya is betrayed and sealed away—only to reawaken as a youthful immortal. Now, he must secretly protect the academy from the shadows while hiding his true identity.