The Space Fortress That Came to the Sengoku Era

The Full-Dive VRMMO Sci-Fi simulation long-time player, Alex, in the last day of Galaxy of Planet, somehow got thrown into the real Sengoku Era along with the constructed space fortress, Silbaan, with one-hundred and twenty organic androids.
There, Alex met Nobunaga and became his retainer arbitrarily.
This is the tale of that Alex and his androids in the Sengoku Era.