This is an automatically translated description

A ghost ship slowly floating in outer space hides a terrible secret.
Someone is lurking in the bowels of the Leviathan... Is it a monster or a confused man?

The huge starship "Leviathan" is drifting in space. What happened here? Marauders seeking to profit from 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?