Sakamoto Ryouta is an unemployed 22-year-old who lives with his mother. In the real world, there may be nothing really special about him, but online, he's one of the world's top players of the combat game Btooom!.

One day, he awakes on what appears to be a tropical island, though he has no memory of how or why he has come to be there. While wandering around, Ryouta sees someone and calls out for help. The stranger responds by throwing a bomb at him! Now Ryouta realizes both that his life is in danger and that he has somehow been trapped in a real-life version of his favourite game! Will Ryouta be able to survive long enough to figure out how and why he ended up here?

Source: Wiki

Note: The first two episodes premiered on Niconico on 29.09.2012. Regular airing started on 04.10.2012.

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