I'm Kouta Koikawa, and I'm having trouble studying. It's not that I'm bothered by the hubbub of my classmates, I specifically sit in front of the audience to avoid their antics. The real problem is my social science teacher, Chieri Hase. From the day she started teaching with us, I can't take my eyes off her! She is a novice teacher, but I am fascinated by every movement of her beautiful body. I can't muster up the courage to confess my feelings-after all, I'm her student, and I'm sure she won't consider such forbidden love decent... until one day fate brings us together during a meeting that will change our lives forever.

Paradise Lost is a visual novel and erotic dating simulator interspersed with simple sub games.

After the tragic death of your father, you have no choice but to move in with your mother (whom you haven't seen for over 15 years) and her family. When you enter a new school, a series of murders begins. You have to find the culprit before it's too late.