Summoned to a sword-and-magic world as its promised hero, Kaito Ukei defeats the Demon Lord only to be betrayed and killed by the comrades and princess he had trusted. The Holy Sword of Vengeance answers the rage he dies with and rewinds time to the moment he was first summoned. Kaito walks the same road again with every memory intact, this time with the beastfolk girl Minnalis at his side and his betrayers' own schemes turned back on them.