The terrorist group announced its independence on the South Pole and placed extremely powerful nitrogen bombs from many shores. They plan to take revenge on the world, forcing them to live for a while in fear, and then die. The United States was not tragically able to neutralize bombs. There are three of them off the coast of Japan, which will explode in 10 days. Fortunately, the Japanese team for neutralizing bombs has a powerful resource. This resource-cool little girl, Machida Machiko. Aranagi Nagito, a student of the deactivator bombs, cares about it. She concluded an agreement with him and with the head of the bomb neutralization program to clear the bombs and clean the world. However, after certain events in their first deactivation operation, it seems that everything that they have left is to be deactivated, written by Machiko.