The bearers of the "27 True Runes" are granted immense power as well as eternal life.

Therefore, wars have been waged to acquire these runes. The Gate Rune Clan has secretly passed down the "Gate Rune" for generations to prevent its power from being used for evil.
However, when the Holy Kingdom of Harmony learned of its existence, they immediately sent troops, burning the village and slaughtering the entire clan.
Fortunately, the bearer of the Gate Rune secretly escaped the danger and remains hidden to this day, but according to rumors, the rune may have ended up in the hands of the Scarlet Moon Empire's Court Mage, Windy...