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22歳、ニートでネットゲーム「BTOOOM!」の世界ランカーである坂本竜太は、目覚めると南海の孤島に連れ去られ、本物の爆弾を手に、見知らぬ他人との爆殺ゲーム、リアルBTOOOM!に参加させられていた! 戸惑う坂本に、容赦ない攻撃が襲い掛かる!

ヒミコ。青い瞳に金髪の女子校生である彼女は、友人たちと普通の学生生活を送っていた。そんな彼女も、ある出来事をきっかけに島に送られてきてしまう。その出来ごとを悔やむ彼女を他所に、島でも魔の手が彼女に襲いかかる――。

While chasing after the mysterious girl, Ryota runs into Taira Kiyoshi who helps fill in the blanks in his memory.

Kira Kosuke is a disturbed child, but when on the island his true nature can finally come out, unchecked. That is until he faces the best Btooom! player in Japan.

A pantless corpse floats by Taira and Sakamoto while they are eating lunch. When Sakamoto leaves to investigate he finds a gruesome scene and a familiar figure.

In the moment of danger, trust issues start to show between Taira and Sakamoto. Sakamoto wants to save everyone especially the girl who just tried to kill him.

Miyamoto, the mercenary, has found Sakamoto and his team. This dangerous player will do anything it takes to win.

As Sakamoto and Himiko try to rest for the night, Himiko wrestles with the idea of telling Sakamoto her true identity, but before she can do anything she is visited by a “ghost”.

A new player has joined Sakamoto's team, but he carries a dark secret. Before the team could dive deeper into the new players past, a food drop overhead brings many players out of hiding.

It seems the players on the island are interconnected in more ways than one. While Sakamoto mulls over this new information, the good doctor begins his end game.

With Ryouta out of the way, Himiko will be an easy target for Date, but Shiki has other plans for the doctor.

Taira has lost it and is attacking his friends. Ryouta doesn't want to fight but this time he truly might not have a choice.