White Lilies Code

A common technician guy inspects a station that's rarely used. Suddenly he finds an unknown girl there. Turned out that she's a representative of extinguished civilization. Her homeland was destroyed by the Black Empire. It would seem she was saved as she'd reached the Earth. But it isn't so. The Black Empire is already here secretly. Its soldiers fight people unseen. The protagonist is actively involved in turning events. He's trying to settle some issues.