Sakamoto Ryuuta 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 in 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, Ryuuta sees someone and calls out for help. The stranger responds by throwing a bomb at him! Now Ryuuta realizes both that his life is in danger, and that he has somehow been trapped in a real-life version of his favorite game! Will Ryuuta be able to survive long enough to figure out how and why he ended up here?

(Source: MangaHelpers)

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Life was peaceful and quiet in the small port village of Miyakono, located in Japan's Kyoto prefecture. Quiet, that is, until the townsfolk were shocked by a rash of bizarre murders. Rumors abounded about the nature of the killer, but one thing was clear: the bodies were mangled by what appeared to be a set of very large teeth.
When a trio of students investigate the temple where the most recent victims were slain, a young man named Yousuke stumbles into and breaks a small shrine, from which emerges a phoenix-like creature made of light that flies towards him and disappears. When he realizes that none of his friends saw the light, Yousuke tries to put it out of his mind... until he is later attacked by the demonic beast that is responsible for the recent deaths. It is then that the phoenix spirit re-appears, offering Yousuke the power to defeat the inhuman beast that is stalking him.
A power, however, that will come at a great cost.