Deimos Deathgame

In the far future, the inner solar system has been colonized. There are all sorts of places to explore, the beautiful terraformed red rocky surface of Mars.
The tropical atmosphere of the moon. And high flying cities on Venus. Yet out of all the places in the solar system, there's one place that people don't come back from. The prison moon Deimos. It's where the worst of the worst criminals go. Which is why when given the opportunity to participate in a life or death game where the winner walks free. Satoshi Ishikawa decides to take up the offer and participate in The Deimos Deathgame.