SM Choukyoushi Hitomi: Bangai Hen Vol 2.

An adult point-and-click adventure game involving the protagonist Maki, with several interactive erotic scenes interspersed throughout. The story is divided into five chapters, and there is a password system implemented by using the cursor to select a specific X/Y coordinate on the screen.
In each erotic scene, the player has to select a correct part of the image displayed to raise a “synchronization rate” to 100%.
This game is notable for its graphic content, even for an unlicensed game, which depicts rape, guro, and even human cannibalism.