The human race advance to the universe, age when it lives in each planet. The fierce battle with space pirates became severe there.

Even the outer solar system, commander Emina of the space warship corps fought against pirates, it is chased by the enemy's reinforcement, to the thing that runs into demon's air region Forrest belt. To demon's air region, warship cronus disappeared 80 years ago. Though Emina search for Cronus... it is living things that waited who have not seen before. And humiliation given mentally and to the body from living things who lurk in large quantities in the darkness. There "Humiliation warship prison" it was.