Following the war's conclusion against the Demon Race, a mid-ranking soldier perishes. However, his story doesn't end there as he awakens in the past as a baby cradled by his birth mother. With a resolve to avert past sorrows, he seizes the opportunity to leverage the wartime innovations in swordsmanship and magic. As he braces for the impending demon threat, he meticulously hones his skills for optimal empowerment.