The Hero and the Sage, Reincarnated and Engaged

When old rivals Raid and Eluria reincarnate and reunite a thousand years after dying, there's only one thing for them to do: settle who's stronger once and for all—even if it means getting engaged and attending the Royal Institute of Magic together!

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英雄と賢者の転生婚　～かつての好敵手と婚約して最強夫婦になりました～（小説）