Fics like Yu-Gi-Oh: Blackzone

[Limit City, a prosperous metropolis, is about to usher in a new dueling season with the opening of the Limit City League; What most do not know is that in its bowels, two secret organizations are waging a hidden war, giving each other no-holds-barred battle: one seeks to control a formidable power and dominate the world, while the other struggles to prevent this catastrophic vision from becoming reality. Two friends who aspire to become top duelists will find themselves caught up in this reality despite themselves, fighting against time in an attempt to prevent an ancient evil from rising again. Will they succeed or fail miserably?] It is a story set in a narratively and contextually different universe from the original. A completely new, unprecedented and original place where there are no characters that appeared in the canonical series, but instead is inhabited by various Oc.

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