Seifuku bisyojo sensei atashi wo daite (2004)

It is the final year of high school and students are studying, taking exams, examining their options after graduation and, oh, catching their teacher having an affair with another teacher. What to do? Well, demand the same treatment of course. Never mind, that the male teacher is married and has a wife who is expecting. Sleeping with the teacher is great, but so is sleeping with a fellow student. What to do?