Tsuyokute New Saga is the Japanese reincarnation, Isekai manga that tells the story of our Hero, Kail, as he works to prevent the demon lord’s great invasion.
The Demon Lord led his army of demons to wipe out the human race. The Hero, Kail, and his allies attacked the Demon Lord’s castle to defeat the Demon Lord. The Demon Lord is slain, but at what cost? Kail lost all of his allies throughout the war. Friends, family, lovers, comrades. All dead, and he is dying.
As Kail’s life ebbs away in the Demon Lord’s chamber, he notices a strange gem that the Demon Lord had coveted and approaches this relic to grab it; after an intense light glows, he is sent years into the past. After recovering from the initial shock, now in his younger body, he decides to avoid making the same mistakes of the first time through these years and to become stronger.
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