Btooom! is an anime series adapted from the manga of the same title by Jun'ya Inoue. The story takes place after the release of a Massively multiplayer online game called Btooom! In the game players are required to utilize stealth and strategy to eliminate each other using the only weapons available to them—a sonar ability to detect nearby players and bombs. One day Ryota Sakamoto awakens to find himself stranded on a tropical island with a pouch full of bombs and a computer chip embedded in his hand. He soon learns that he has been entered into a competition where he must play Btooom! for real—where losing means death.