higashi no eden
An anime series that premiered in 2009.
On November 22, 2010, ten missiles struck uninhabited areas of Japan, claiming no victims. This apparent terrorist act is referred to as "Careless Monday" and disregarded by most people. The series begins three months later, with a young Japanese woman named Morimi Saki visiting Washington D.C. as part of her graduation trip. When she gets into trouble, a mysterious Japanese man, who introduces himself as Takizawa Akira, helps her through it. The man appears to have no memory and is completely naked, carrying only a gun and a cell phone charged with 8.2 billion yen in digital money.