Virtual Invasion of Reality: A Lucky Player's Extraordinary Local Specialties

My pet went missing, but my luck got better.

“Ding! Your pet sent you an extraordinary local specialty: Terror Black Armor.”

“Ding! Your pet sent you an extraordinary local specialty: First-Generation Divine Body Source Fluid.”

“Ding! Your pet sent you an extraordinary local specialty: Archangel of Judgment, Kayle.”

…

In the twenty-fifth century, games invaded reality.

Mutated beasts from the games pour into the real world by the hundreds of millions at regular intervals...

When humanity's population had plummeted from twenty billion to two billion, a mark resembling a frog's head began appearing on the creatures still living in the real world. It was called the “Travel Mark.”

As long as humans made a contract with an animal, bird, fish, or insect bearing the Travel Frog mark,

that creature would become their Travel Beast and journey to the game world.

When a Travel Beast returned from its trip, it would bring back extraordinary local specialties from the game. These might be virtual weapons, armor, items, medicines, cultivation manuals, blueprints for advanced technology, talent cards, mysterious fruits, or pet eggs... They could even be angels, succubi, flower sprites, fairies, dragons, and more from the game world. Of course, if you were unlucky, your Travel Beast might bring back nothing but a few leaves or a rock...