Diamonds(1997)

Tenohira ni Diamonds

Because she wants to leave on vacation, Riko accepts to date an older man ... for money. A first step towards an uncharted ground and dangerous ...
Because easy money is attractive and the desire to spend it permanent.
Should we live under a rain of diamonds to be happy?
Torn between her desires and ideals, Riko will have to find her way.

(Source: Milan, translated)