This world exists in the world where players on Earth are struggling to conquer various dungeons, trying to become stronger and protect the earth. Lake, who traveled through time, discovered that most of the dungeons that players in this world feel are dangerous are all that he has seen before. After the movie was modified, Lake began to pass the dungeon, brought out black technology from the dungeon, and led the earth into the era of black technology. Start by gathering manpower and material resources from all over the world, building mechas, and fighting against the invasion of giant beasts. Can defeat the giant beasts Yes, only mechs. At this moment, only black technology can save the world. Lake, the strongest black technology savior, short-term goal, first build a galaxy defense line!