Shadow Island is an adult visual novel/dating sim game with point-and-click and sandbox gameplay. It is set in a Victorian fantasy world inspired by the work of H.P. Lovecraft and contains strong language, some elements of horror and a lot of pornographic images and animations.

When a sudden storm wrecks your ship, the only survivors are you, your sister and her nanny. The three of you are washed ashore on an uncharted island, but only two of you are rescued, taken in by an undocumented British colony.

Now your sister is missing… They're telling you she is dead, that no one could survive outside the village, but you know better. You'll find her, whatever it takes.

Soon, it becomes clear that the island holds many dark secrets which could threaten your life and sanity. Just where did these people come from? Why does no one go into the woods at night? What are these strange looks everyone gives you? And what has happened to your sister? Your quest is complicated by the island's many, beautiful women who all seem to have a special interest in you… and secret agendas of their own…

Will you uncover the island's secrets before they consume you? Or will you give in to temptation and depravity?