On November 22, 2010 ten missiles strike Japan. However, this unprecedented terrorist act, later to be called "Careless Monday", does not result in any apparent victims, and is soon forgotten. Then, three months later... Morimi Saki, a young woman currently in the United States of America on her graduation trip, gets into trouble in front of the White House in Washington DC, and only the unexpected intervention of a fellow countryman saves her.

However, this man, who introduces himself as Takizawa Akira, is a complete mystery. He appears to have lost his memory and he is stark naked, except for the gun he holds in one hand, and a mobile phone in the other. A phone that is charged with 8,200,000,000 yen in digital cash.