The Secret Us Government laboratory holding top secret information and layout of the Nuclear Warfare Bomb that can be used for complete destruction. Russian spy aka Pain is the antagonist trying to secure the information and the US spy aka Itachi is the one who will protect the information.
Pain goes on a secret mission to secure the information from the US government Laboratory. Leaving Russia and entering US.
Pain needed to know where the laboratory, but because of Russia technology, he figured it out quickly.
When he got there, he sneak inside but because of US technology defence, the whole organization was warned including Itachi.
The orgizination tried to stop Pain but Pain is too strong and killed all of them. Only Itachi could beat Pain.
After Pain got rid of the people who was on the way, he can finally captured the layout information. While escaping the laboratory, US Spy Itachi showed up and try to stop Pain.