Door to the World

In 3978 AD, a series of gates that came from nowhere rose up on Blue Star... At first, people didn't pay attention. When the unknown creature inside the door broke out, people realized the seriousness of the problem. After winning the battle at a heavy price, everyone found that they had a game system. After that, unions were established one after another to explore these doors one by one... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.