About the Legend of the Legendary Alliance of Travelers

When pi is calculated, the truth of the virtual world is revealed. Zhang Chi joined the "Travelers Alliance", obtained poisonous apples in Fairy Tale Town, stole sword secrets in the rivers and lakes, and searched for charred wood in Diagon Alley, until he sneaked into the heart of the steel beast that drives the earth and eavesdropped on the whispers of civilized tombstones. What he doesn't know is that the "Black Fire Brand" and "Rule Wail" he brought back are dragging him into an ancient mystery related to the survival of the entire world.