Saru is a talented young locksmith who unlocks any kind of lock. He is, however, a complete fool when it comes to women. One day a girl Mayumi asks him to open a safe full of stolen money. Knowing nothing about it, Saru takes the money briefcase with Mayumi and finds himself with yakuza gangsters and also police in hot pursuit.

"All he did was unlock a safe... And now the chase is on!"