Key of Life , Kagi Dorob no Method? , lit. TheA Key Thiefs Method is a 2012 Japanese comedy film directed by Kenji Uchida. The film opened in Japan on September 15, 2012.
Their paths cross when Sakurai and Kondo go to the same bathhouse. Undressing near each other, Sakurai clearly envies Kondos designer clothes and accessories, luxury car keys, and heavy wallet. When Kondo slips on a bar of soap and hits his head, knocking himself unconscious, Sakurai switches locker keys and uses Kondos key to steal his clothes, car keys, wallet, and identity. His first action is to repay all of his debts. After doing so, Sakurai begins to feel guilty about stealing Kondos identity and visit him in the hospital. There, Kondo wakes up, but it is clear that he has amnesia. Realizing that he can get away with what he did, Sakurai backs out of his plan to return what he stole to Kondo. He instead continues to live off of Kondos wealth. The newly conscious Kondo, freshly discharged from the hospital, attempts to make sense of the life he assumes is his own but which is Sakurais. On his way home from the hospital, Kondo meets Mizushima, who had been visiting her terminally ill father she offers to give him a ride to his apartment, and they strike up a friendship. Eventually, despite having known him for a very brief amount of time, Mizushima asks Kondo to marry her, a request which he accepts confusedly.Shortly after discovering that Kondos luxury apartment has many secret storage areas filled with officiallooking uniforms and other disguises, spy gadgets, and illegal weapons, Sakurai gets a call from a yakuza boss asking him to kill Ayako Inoue, the fiance of the man whom Kondo killed in his first scene. After learning that almost noone knows what Kondo looks like, and believing that he would be better off trying to refuse the job politely than simply hide from the yakuza, Sakurai agrees to meet the boss. The boss tells Sakurai that Ayakos fianc stole a large amount of money from the yakuza syndicate and that he is sure that Ayako knows where it is hidden. She persists in pleading ignorance. Sakurai is appalled by the prospect of having to kill someone
Source: Wikipedia