The story is a mix of low system type and low fantasy that has elements of magic as well.

The story followed around Dean Ken. He is an assassin and former knight of Kingdom's central Knight Order. In order to take revenge for his beloved woman he assassinated the king of the Gaosai Kingdom and finally perished with him. But surprisingly he went back to when he was eighteen. Now with the knowledge of the future he is determined to make his enemy pay the price

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