Vipers Labyrinth

Moontachi Gaiden Book 1:

When the Sun leaves, the Moon shall rise.
With mystery comes colossal power. Legends tell of the Great Moon. The savior for all humanity during the reign of the Hundred Hands Emperor.
One fateful summer, a boy named Alistor seeks the thrill of adventure just like the Great Moon. However, he often dreams in junior high for a greater purpose until he crosses paths with the mysterious Mr. Rare. A maker who crafts one-of-a-kind works. Presenting a forsaken mirror, Rare offers him the chance of a lifetime.
Without second thoughts, he accepts the ordeal of unleashing a great evil. The Aggerona Empire quickly descends to his very world with monsters. Awakened once more, Emperor Vilevelious deploys his demon generals to gather negative energy, hoping to unlock the secret hidden within the Labyrinth.
With help from a shady money-obsessed chef, Alistor gathers a glamorous team and embarks on a wild journey. Forever changing the world, he once knew.