Japan is in trouble. Serious trouble, to the tune of 800 trillion yen. At the current rate of national debt accumulation, the country will effectively collapse in a few years' time. The Ministry of Finance traces the beginning of the end to 1990 when a real estate cap set in motion a series of events that caused the bubble economy to burst, plunging the nation into hard economic times. But the Ministry has a crack plan to reverse all this. Into the picture comes flighty indebted bar hostess Mayumi (Hirosue Ryoko) whose mother has just passed away - or so she thinks until grave-faced civil servant Shimokawaji (Abe Hiroshi) shows up on her doorstep. It turns out her mother Mariko (Yakushimaru Hiroko) invented a time machine and traveled back in time to prevent the Finance Minister from making his disastrous policy move. Mariko has since gone missing, however, and now it's up to Mayumi to go back to 1990 to find her mom and, oh yes, save Japan.