Higashi no Eden

Synopsis

Saki Morimi has just graduated from college and is visiting Washington D.C.. When she gets into trouble with the police for attempting to throw a coin into the White House fountain, a mysterious Japanese boy helps her out. The boy appears to have no memory and is completely naked, carrying only a gun and a cell phone. He returns home and finds bullets, a homemade gun and fake passports in his apartment. He remarks about how his apartment makes him feel like he is in 'Taxi Driver'. Before leaving he burns the fake passports in a toaster. Juiz, who claims to be his concierge tells him over the phone that his memory was wiped. Later he takes on the identity Akira Takizawa and decides to go back to Japan along with Saki. While waiting for their flight, they watch a news covering a missile attack on Tokyo.

(Source: Wikipedia)