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Book 1: Leviathan. Vol. 1

A ghost ship slowly floating in outer space hides a terrible secret.< Someone is hiding in the depths of the Leviathan ... Is it a miracle or a confused person? What happened here? Marauders seeking to make a killing on the deserted ship find a schoolboy's diary. The boy, whose name is Kazuma, went to Earth with his classmates on this ship many years ago. The excursion never reached its destination.
Something happened... Explosions damaged the ship. They were attacked? Breakdown? It is unclear.
However, everyone who was on the Leviathan was trapped in a void in a tin can, which will soon run out of air. Kazuma and his friend heard this when the teacher was talking to the service robot. The rescuers will not make it. Everyone will die. Except for those who manage to get to the cryo-chamber in the heart of the ship. It can accept only one person.

Only this person will have a chance to survive. But will you be able to be called human if you emerge victorious in a fierce battle for survival against all?

Book 2. Leviathan. Vol. 2

Treasure hunters among the space junk see a huge abandoned ship as an opportunity to make a profit, but if they look closely, they see a threat.

Nobody could have survived here, because the air ran out faster than the rescuers could have. But there is a nuance. In the bowels of the Leviathan, there was a cryo-chamber that should have given a chance for rescue. And when there were no adults left alive, the children learnt that it was possible to survive. It is possible for one person to survive."

But what if each of them thinks he is the one? Perhaps the abandoned ship on which the pirates are now slowly travelling has long ago become the scene of the most brutal deadly battle possible, and its winner is now sleeping in a cryo-chamber...

Who is it? A lucky man who managed to escape the battle and remained human? Or a monster who tainted his desire to live with the blood of other children?