Wakaokusama no namashitagi: Ikasete (1990)

Two sisters who used to work as call girls at a hotel. The older sister has retired and is now living happily as the wife of a police officer. The younger sister is still actively working as a call girl at a hotel. When the younger sister notices that a police investigation has befallen her, she runs away, and the older sister chases after her, and the two end up heading to their hometown on a road trip.