Oinaru gen-ei (1999)

Haru and Michi are restless 20-somethings whose relationship with each other is not going well. Michi wants to go abroad, but discovers that her passport has been cancelled. She reluctantly returns home and goes back to the boring post office job she was hoping to leave. However, today offers some unforseen excitement -- two masked men from a local street gang have come to rob the post office. When Michi rips the mask off of one of the gunmen, she is shocked to find that it is Haru.