The Tokyo Metro central computer has been cracked! Out of the chaos of wild passengers and a frantic transport ministry, Cloud's story begins. A child prodigy who has grown up into a black hat hacker strives to fulfil his impossible dream of making a kingdom on top of the clouds! But how will he do this and what will the government and police even allow him to try?

Follow Ryu as he plays in the mahjong world with gangsters, crooks, and all sorts of people.

Oda Yuuma is an odd young man. He can float off the ground. He can see into the future. He scares the crap out of some of his classmates and teachers. There is a physicist trying to understand how he does what he does, but Oda-kun has his own agenda, and it involves a possible future he has seen of a girl from his school…
(Source: MangaHelpers)