Gakuen 2 ~Ingyaku no Zushiki~
Original title: 学園2～淫虐の図式～
This is the direct sequel to Gakuen. In this game you play as Kawamura who likes to take advantage of girls and have sex with them at school. Eventually his foul practice is caught, so he's basically going to be expelled. Well Kawamura has other plans. He's going to get to school principal by getting to her daughter.
Download and install instructions
Game is available for direct download from various file storage providers. Install instructions can be found on developer website.