Sinopsis:
Cerita ini berpusat di sekitar Ryuuta Sakamoto, seorang pemuda NEET (Not in Education, Employment, or Training) dan pemain peringkat atas dalam permainan Btooom!, sebuah permainan tempur online!
Suatu hari, ia terbangun di sebuah pulau tropis tanpa mengingat bagaimana ia bisa sampai ke sana. Dia melihat sosok di kejauhan dan meminta bantuan. Namun, sosok itu menjawab dengan melemparkan sesuatu pada Ryuuta – sebuah bom "BIM". Pada saat itulah, Ryuuta akhirnya menyadari dua hal: pertama, hidupnya dalam bahaya, kedua, dia sekarang ada dalam dunia Btooom!

Ryōta Sakamoto 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 called 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, Ryōta sees someone and calls out for help. The stranger responds by throwing a bomb at him! Now Ryōta 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 Ryōta be able to survive long enough to figure out how and why he ended up here?

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