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

Synopsis:

Sword Saint Brise's exceptional sword skills saved the nation.He is reincarnated as the youngest prince of the nation at the conclusion of his glorious life, but he keeps his memories.He aims to enroll in Knight School's elementary school and seeks freedom once more.He unexpectedly fails despite being an unbeatable swordsman! "I came to pick you up."Despite his childlike appearance, he is a formidable former swordsman.His previous pupil picks him up in his reincarnation!?