Porn Game: Jokei Kazoku III ~Himitsu by Silky's (Jap)

Karasawa Island belongs to an influential family,
in which they honored the power of men over women.
But, after the death of the head, it turned out that there was no male heir.
Therefore, in order not to lose prestige, it was decided to call four daughters, and choose a decent one among them.
Tomoki, the protagonist of this story, arrived on the island for revenge on Itami, the husband of his eldest daughter.
The hero knew that the death of the head of the family was not accidental - Itami had a hand in this
and temporarily began to manage all the money, ruining the company.
To achieve his goal, Tomoki will take any measures. Four beautiful girls and revenge
as the leitmotif of history, they promise an exciting struggle for power on the island,
which could become a prison or grave for one of the heroes ...

Jokei Kazoku III ~Himitsu by Silky's (Jap) game preview

online.