Tensei shite Shota Ouji ni Natta Kensei wa, Katsute no Deshi ni wa Zettai ni Baretakunai

Brise, the legendary Sword Saint, once saved an entire nation through his unparalleled and unique swordsmanship. After living a magnificent life defined by martial glory, he dies and is unexpectedly reincarnated as the kingdom's youngest prince, retaining every memory of his past existence. Yearning for a fresh start and the freedom he never fully enjoyed, Brise sets his sights on a modest goal: enrolling in the elementary division of the royal knight academy. However, despite being an invincible swordsman in his previous life, his plans take a shocking turn when he inexplicably fails the entrance examination. Now trapped in the body of a young child yet possessing the mind and skills of a supreme warrior, Brise simply wants to navigate his new life quietly. His desire for anonymity is abruptly shattered when a familiar figure arrives with a startling declaration: "I came to get you." To his dismay, the person who has come to claim him is none other than his own former disciple. Forced into close proximity with someone who knew him best, the disguised Sword Saint must desperately conceal his true identity, knowing that if his past self is ever exposed to his old student, his peaceful new life will be entirely upended.