Belladonna is the name of a flower that is both beautiful and extremely poisonous. But it's also the name of the goddess who cuts the fate threads with scissors.

Main character is asked to fulfill a request if he wants to return former lover and get a billion yen. The request is to persuade former lover to abandon all her claims to her dead husband's corporation. Any means are allowed, so he can choose to cultivate love or lust in mansion girls to reach his goal.

[From vndbreview]

A "love training adventure game".