Not long after the appearance of the gate, a group went in to investigate the gate. Among the group only one man survived. Tahara now spends his time in his office taking care of the flower he found in the gate. But things are about to change as a group targets him for his research on contractors and the gate. Can Hei and the others get the information first?

After meeting with Amber, Hei learns that against common knowledge Contractors can become more humane than was thought to be possible. Realising his own position between the world of contractors and humans, Hei has to make the decisive choice for both. With final farewells to his past comrades inside the Gate, and their support behind his back, Hei's decision brings new future for the world.